Cant figure wiring out

Go to this link for wiring diagrams. http://bbbind.com/free_tsb.html

Low fuel pressure or a faulty injector.

What do you mean the 1977 had no coil or distributor, was it removed or stolen?

When you change the crank sensor you need a scan tool to set them.The distributor has to be turned using a scan tool to get the crank sensor dialed in.

Check the hot wire going to/at the distributor .. a number of these were crimped on the wires insulation/casing and not on the wire itself,,, it makes intermittent connection.
..This is hard to diagnose,, your symptoms are exactly what this causes... Good luck...

As long as chevy hasn't changed the firing order it should be 18436572 and the distributor runs clockwise. So if the distributor is installed properly then the pin pointing toward the driver side front of the engine should be number one and that goes to number one cylinder which is the drivers side front. The cylinder banks are easy the drivers side is odd 1357 and the passenger side is even 2468 front to back.

try pulling the vacumn pipe off the EGR valve

Did you check for codes. It won't matter what you change if your computer failed. You should of payed the diag fee. You would of saved alot of money.

that code usually means the distributor was moved and the cam and crank signal sync is off,you mwill need a scanner capable of data display to reset it,it should be near or at 0 degrees,if you do not have access to a scanner your local shop should be more than capable of reseting it.hope this helped

CAM SENSOR IS IN THE DISTRIBUTOR ON THE V6 ENGINE.ON V8 ENGINE CAM SENSOR ON THE ENGINE BLOCK.