Magnum swap starts, does not run

hey dave, another dave here. I did mine with a 5.2 mag. from a 01 ram, but it was obd2. not real sporty on the obd 1. I do know that it needs around 30-33lbs of pressure at the rails at start up. also, on mine, I had to hook the start and key on wire together for the switched power wire. I know the security set up will let it start and run for a few seconds then die. it will do this 5 or 6 times then it wont start at all. again this is on the obd2 system. yours may not have this being a 94. there's several here that's done the earlier system, and I'm sure they will chime in. be glad to help if I can. dave.