The problem with those old 318's is making decent compression.

There's been threads about this before and the KB hypereutectics are the ONLY budget oriented offerings out there. And w/o them you're limited to running the 85 era "swirl-port" that have small valves & ports.

It's kind of a Pandora's box, either hone it, ring&bearing it or do it right with the KB's and some freshened X, J, or Magnum heads.