When I did mine I got a module that didn't align up to space it right with the acrylic spacer, I just elongate the hole. Like everyone said, make sure the ground is good and also you have to bypass the resister wire and run straight 12v to it iirc.
Update: I got the correct unit and installed it and it is like a completely different vehicle. It starts with a tap of the key now, no pumping, cranking or stalling! The rebuilt carb obviously has a lot to do with it as well but this is definitely the outcome I was hoping for!