HEI in Mopar ECU casing

I got the parts from the junkyard to do the HEI conversion, got the 8 pin module that trail beast recommends. I rigged it all up to make sure it all worked and it did. I decided that i wanted to gut the original mopar box and hide the HEI in it and just use the original mopar plug and all so it looked original. Well, got it all done and it wont spark. Should have known it wouldnt work with my stupid luck. Theres no reason for it not to work but it wont. I even ran a jumper from the negative post on the battery to the module ground to make sure it is properly grounded.. Just really dont understand why it wont work through the factory wiring and plug.. pisses me off as ive been wanting to get this done for a month and finally do and it aint gonna work!