I just did the 350/455 swap. I have a 1970 350 sitting here looking all lonely. I am thiinking about keeping it and putting it in something. This motor was bored .030 over several years ago when it was rebuilt. This motor needs a complete rebuild. Clattering badly when taken out. Can this block be bored another .030 over? What is the max for the 350? I hate to get rid of something I may regret later.
Oversized pistons available for the 350 in .030, .040, .060. Spend a few bucks to have the block sonic-checked for core shift, and save your .030 over pistons, somebody out there [like me] will want them!