Magnum swap starts, does not run

Okay, so I tried starting my car today for the first time. It starts, runs for a couple seconds then dies. The amount of time it "runs" is not consistent. Working the gas pedal doesn't seem to have any effect.

I have good fuel pressure at the rail- with key on it is 12-14 PSI and it climbs for the short time that the motor is running.

I double checked that we have the spark plug wires routed correctly. Distributor was never removed, so it should be fine.

This is the set up:
Out of a 1994 Jeep Grand Cherokee (OBD I). Ran great in the Jeep. Using the Jeep relay/fuse box. Everything is stock for the Jeep. I have removed all the EGR and Evap equipment.
Neutral safety is grounded at the computer. I have one wire hot to the computer all the time, one wire hot on key on.
I tried to check codes using the CEL wire off the PCM, but it doesn't light my test light and my voltmeter doesn't move enough to discern how many times it's flashing.
I had heard that the ignition switch has a dead spot between start and run that the PCM does not like, so I wired in a start button so it would not cause an issue.
Jeep had an auto, I swapped in a 5-speed. I put in the correct V8 flywheel and had to change the crank sensor to a manual shift sensor. The two sensors had differing wiring connectors, so I swapped the connectors. Not sure if this may be incorrect.

Not sure what else to look at. I've heard that the Jeep's have a security feature that needs to be disabled. I'm going to start searching for that, but does anyone have anything I should look at first?

Any help is greatly appreciated.

-Dave