Super Cool!
if it had a 351m or 400, I believe that will be a different bolt pattern for the transmission that the more contemporary small block engines (300-6, 302, 351, etc). I dont know as much about "non small block" fords, but Im sure someone will step in and tell you which engines would be potential bolt in replacements. Do you know which Automatic transmission you have? Besides the engine, do you know of any other mechanical work it needs? Id love to have a light 4x4 3/4 ton work truck. consider me jealous!
1984 Bronco, mild built 300-6, Np435, 3.55 gears, 8.8 rear with Eaton TrueTrac, D44 TTB front, 31" tires, MSD ignition, Offy C, EFI manifolds, Holley 390, No AC, 3G alternator, front receiver
1988 F250 "One Piece at a Time" - 460 ZF5 4x4 work truck project under construction