360 sound good still?
rust pits are funny..They are deeper than they look, every time. It may be ok, butthe only way to know for sure, is to bore the holes in question. I had a 440 recently that measured out (indicator in the deepest part of the pits, block had already been shot blasted) and would be fine for .040 oversized. Needless to say, I now have a rough bored .055 over block. Also, keep in mind, many great 360s or 360 based blocks are running around at .060 over with no trouble.