68 and up 400s and 455s are the engines I assume are 10.235ish. I also agree the older blocks tend to have taller decks. When picking out pistons or planning on decking the block I generally assume 389s and 421s are 10.24”, and the first gen 389 from 59 to 61 10.245”. 10.25” might be close on those old block though. I have not seen enough of them to make a good guess.
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