Sounds like it’s being a real challenge. Hang in there. I went through something similar with my choptop at one point. Pulled a known good motor out of a junkyard truck and dropped it in. No start. Chased things, cussed at it, and finally started swapping known good parts off my old motor and putting new parts on and fought with it for a couple weeks, ran the battery down I dunno how many times trying to get it to start, and I still have zero idea what was preventing it from starting. I was working on it and scratching my head and the battery ran down and I wanted to fight with it a little tiny bit more so I hooked up jumper cables to my Ranger and VVrrroooommmm…. Da fawk… thing ran great after that, no hesitation to start. Hooking up jumper cables should have fixed absolutely nothing.