1971 340 Build - Choosing piston rings dilemma

I wouldn't have went that far if I didn't have too. 30 was a no go so we tried 40 and it almost got there. There was two tiny spots in the 1 and 8 cylinders that didn't clean up and probably it would have been fine to run it like that but I didn't want to chance getting blow by, a weak cylinder or even worse a broke ring.
Yes well good luck, hope the tough Mopar blocks reputation doesn't let you down. But I'm surprised that the machine shop didn't suggest that you sleeve those bores. If they were the only two bores that were stopping you leaving it at a healthy 030 or 040 then that would have been an easy solution. Or even if it had been three or four bores like that, then sleeving, if done properly, and then machined down, is a great way of restoring a block with doubtful walls.