I have an 89 F250 with a multi port fuel injected 351. Can I replace the manifold and fuel system (carb, fuel pump, ingition, the works) with parts from my '74 351c out of my rusting out F250. Or would it be easier to just swap out the entire motor because I know the trany would match up.. I'm just concerned with the electrical. Also, in the 89 F250, would switching over to an older motor play havock on the computer in it. Any input would be greatly helpful.