1975 360 block info.

Demonracer said
For your own peace of mind, have them sonic tested.

There is no good year/bad year.
Best answer right there.

I’ve had the supposed early 340 blocks that are said to be able to be bored out to 4.100 sonic check crap walls as cast @ less than .060 thick.

IMO, it’s he good block/bad block years are myth and bullshit.
The only true way to know is sonic check the block.