Howdy,
I have 83 Buick Electra with a small block 307 olds that I would like to replace with a big block 400 or 455 olds. I'm told that the only major difference is the width between heads and deck height. Will this be a easy swap and can a Pontiac or Buick 400 or 455 be used as well?
Thanks, NeoVintage

please keep this in the original post. it gets too confusing when you have it in more than one.