DOES A 1987 305 CHEVY ENG HAS A COMPUTOR.

Hi Kenneth:
"Barrels" in my terminology refers to the number of air inlet ports through a carbuerettor. ie. 2 barrel Rochester, 4 barrell Holley.
You don't actually change the number of these barrels without changing carbuerettors.
If that's not what you're referring to, let me know.

This one is not for California. If you have california car, please let me know

that 2 barrell needs some more work done to it and what was wrong with the 4 barrell the 2 main jets in a 4 barrell are smaller than a 2 barrell as long as you dont engage the 4 barrells your using less gas anyways.

There is no difference in intakes on how they bolt on, both intakes bolt on the same, just make sure you use new gasgets, and also use red silacone on each end insted of the rubber gasgets they supply with the gasget kit so you get a better seal.

i had the same problem and this sounds funny but on the top front of your motor theres the big hose that comes from the rad. theres a sending unit for the temp. it got 2 wires on it, will try changing that. that what tells your computor whether its cold or warm, if that goes bad you could be trying to start your van and the computor could be saying that the motor is hot. i hope you know what i mean if not get a hold of me.

To change to a 4 bbl u wil need to change the intake manifold, as for the heads only if u are going to preformance. Changing diffeent 2 bbls will not be of any advantage to you.

Make sure your valve cover is tight. They are known to come loose. Ckeck oil filter tightness and be sure when you change oil the old gasket of filter does not stick to bkock.This will cause an improper seal.

Exesive CrankCase Pressure, Check PCV Probably Cloged

it sounds like you may have the wires on the wrong coil. It should be #1 on the #4 coil, and the #3 wire on the #2 coil. you probably have them backwards so 1 and 3 are firing on the exhaust stroke.
the firing order is 1-3-4-2.
they should be hooked like this.

eng light on OBD 2 scan for fault code! then proceed no eng light test coil????