Help on my 440 Duster

i am running the Electronic conversion kit that i got from year one it had the ecu aka the Orange box all that stuff is new because last year i replaced it all. not the starting dragging just wont fire but what seems to getting it over the hump is hooking it up to my truck and letting it sit then just crank away
this is as far as I have read as so as I seen you had the ORANGE BOX I know that has to be your problem I have had two of them and they have dun the same thing put a chrome one on and for get about it.I always put a spare next to the one I'm running..just in case..and make sure all the grounds are good I always ad extra....