5.7 Hemi Swap Tech question

I put a 5.7 hemi in my 68 dodge dart and Im having some problems with the engine. It will not fire the injectors while it is cranking. If I give it a shot of ether it will pop off and then the injectors start to fire. I have power to the injectors, the computer just isnt grounding them out when they are suppose to fire. Ive tried to trick the computer into thinking it was running and still no injectors. Is anyone familar with the 5.7 wiring or has a clue what would cause this? Also while the engine is running, i have no response from the foot pedal. I have 2 ecm"s. One that came with the harness I ordered for this build and the original one from the donar vehicle. Neither will work right. Feel like something is missing from the harness I ordered. Please help!​