Chevy 3500

Has anyone heard how to swap a 6.5 liter turbo diesel to a 7.4 liter 454? If there are any web sites on swiching engines for the 3500 please let me know id really appreciate it. Or if you know how to do it let me know. I have the engine in. The truck is a extended cab 1993 3500 and im trying to use the old wiring harnesses for the new computer and need help figuring it out. I have the fuel lines in and the starter. The engine cranks i pluged the battery in and tested it. Its good I just need the ignition, fuel injection, ect. wiring diagram. The engine is out of a 1999 3500 so it is compatable.