I resurrected a 78 Magnum, 360 that had sat for 20 plus years. The lean burn is a nightmare with about 7 critical sensors, and the ignition unit is mounted to the air cleaner. Mopar has a conversion for it. I highly recommend removing the tank and having it dipped. Roppels in Louisville KY did mine with lifetime warranty for rust. Also, if you have a Holley carb, the Holly factory custom shop in Bowling Green KY can do a great build/repair back to factory specs. It cost me $10 bucks more for that than an aftermarket carb.
Mine still has a slight miss at high speed, 55-65, but I think it is doing the best it can with all original electronics and sensors.