Need some engine buildup help

Hi, your car sounds like mine when I bought it in 1991. The wiring was a nightmare. Find a doner car and get the whole harness. And pull the whole harness out of yours.Find a doner that has not been hacked up(may be hard to find, but they are out there.) The one thing you dont want to risk is fire. As for the eng. My duster back in the day had a super cammado 360 crate engine that mopar performance had in the mid 90's. Its wasn't a dealer bought eng(crate) Me and my dad took the list of parts mopar used and ordered them from summit,had our own block bored and put it together. It was a strong running streetable combo. You could run low 13's and drive it on trips. I drove to the mopar nats and back (about 1000 miles) and ran fine.