1996 Jeep Grand Cherokee Cranks but well not start i have replace spark plug fuel filter and D-cap and air filter is firing order 6,3,5,1,4,2

An engine needs 3 things to run. Fuel, Air and spark. You've checked the spark so move onto the air and fuel system. I'm assuming you did a full service on the replacement engine after you fitted it? Even a dirty Air filter can cause bigger issue that you would expect.
Have you checked to see if the engine is getting Fuel? If it is just turning over and not trying it might not be getting fuel to the cylinders. When you checked the plugs for a spark were they wet and smell of fuel when you first took them out?
Have you had the vehicle scanned with an OBD2 scanner for trouble codes? These can give clues to what and where the problem might be. If you have to pay for the scan get prices at 4 or 5 different places as prices can be VERY different.

1-5-3-6-2-4 Clockwise alt="Cables order">

have you replaced /checked air filter and intake hose, could be blocked and starving engine of air

THE JEEP ZJ ! NO ENGINE STATED, so real hard to help !!!!
cranks robustly (crank shaft actually turns, look)
and will not start.?
no engine stated, there are many , must know engine to fix them.
so did you check spark at all cylinders. ?
and timing of them.
and spark wire firing order, one guy had a friend swap them for fun.
(he had a accident later.. LOL)
if spark is hot on all 4 or 6 cylinders.
and #1 fires near zero on the pulley, then
try test fuel, spray it. runs for 3 seconds and sounds good.
that mean engine and spark are good and you lost fueling
the steps are same 1920 to now, on mr. otto cycle engines.

a 60k tune up is more.
1: spark plugs , J plugs, stock & gap'ed right.
2: spark wire. new.
3: cap and rotor.
4: air filter, and fuel filter.

when you replaced the dizzy(why?) did you read the FSM
to retime it, it times injection too.
be sad to make it worse throwing parts on top of a good dizzy

there is no reason to replace the DIZZY unless
one of these fails #42 or 54. 54 is dead dizzy Cmp sensor.
ever see this? DIAGNOSICS.
https://sites.google.com/site/thezjpage/zj-diagnostic-trouble-codes-dtc-s

got a ignition spark strobe light?, this is childs play.
check spark x6
check firing near TDC #1 , near 0 degrees. see hood spec for exact spec. (open hood ,USA, look up, see EPA, timing spec, BINGO.)
and firing order, do not cross wire to wrong plugs
do not guess at firing order or rotor direction or all this fails.
true for all cars with dizzy,
the fsm is there. no need to guess. ever

ZJ
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

1. if engine is good (compresson)
2. and spark is good
3. and not flooded, (look)

if not flooded it will run for 3 seconds, at least.
if flooded
use super secret , unflood mode, crank WOT
wide open throttle, its in the oper , guide this for all cars made, 1988 to now.

It varies greatly on how much you want to spend and how much of a tune up your doing. For me replacing all the spark plugs, spark plug wires, cap and rotor, air filter, oil change/ oil filter change and fuel filter change is a big tune up that would run a do it yourselfer about $80- $125.00 or more if you get higher performance parts. You can also add to that coolant flush and some good fuel additive. make sure to check your serpentine belt for cracks or wear.

TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.

Check the Jeep Grand Cherokee 1993-1998 - Firing Order or read your Service Manual for other details.

Good luck (remember rated this post).

Non-adjustable timing.

Firing order 1-5-3-6-2-4 ------------- front | | of | 1 2 3 4 5 6 | vehicle | | Distributor rotates clockwise ------------
The Spark Plug Gap .035 (In thousandths of an inch)

front to back cylinders are 1 2 3 4 5 6 on your cap there should be a #1 going clock wise here is the firing order 1 5 3 6 2 4

Firing order for the 4.0L 6-cylinder is as follows:

1-5-3-6-2-4

As for the spark plugs, it looks like the Autolite AL 985 plugs are what you need. If you are going to replace the plugs, might as well also replace the plug wires, the distributor cap and rotor (if you have those, I dont recall which year they went to the distributorless ignition).