Wiring is shot also..agree with Chris...
I am a new poster and hope I have this post in the correct forum.
I have a 1973 Uniflite 31 Sport Sedan with twin Chrysler 318's with Paragon 1.5:1
I would try and find a good running "NEWER" engine you can actually get parts for before dumping money into an engine that was run hot and busted
Use the factory specified spark plug. They will need the serial number for this.
PLEASE DO NOT USE SEAFOAM IN A FUEL INJECTED ENGINE! IT
Hey, that's better. It's a 1989.