Can anyone tell me if Pontiac used basically the same block ? I need to bore mine .030. I can only find pistons that are .060 over. I know that they had a 3 1/4" bore in 1940 and in 1949 it was 3 3/8 . The .060 would be about 3 5/16 (3.310) It sounds like it's OK but before I have it bored I'd like more info.