I have a 1961 c-60 that has a 235 engine that is smoking pretty good.Rebuilt 235 and 261's are hard to find and are big money if you do.I have a good 350 that I could put in, but how much trouble is this gonna be? Will it bolt up to the bell housing? What other problems? Would it have to be an older model 350, or say 327 or 283? Thanks for your help,Jim.