The answer to all things is "yes". The 455 should be a pretty easy swap. Whether or not it runs, or runs well, is a totally different animal. As for the 350 it has tons of potential. Especially if someone has a 70's era bird with a smogger in it. Those 47 heads would freshen any 70's 350 nicely. Either way i would wait until that 455 is up and running before you move it.