Dang...

600hp?
Musta had 302 heads on it.

When I was building some 318 roundy-round engines 30 years ago....... we had one blow out a cylinder wall.
The whole side of the bore basically disintegrated.
The walls were surprisingly thin.
It was a roller cam block with a couple seasons on it......stock stroke, .030 over, 2bbl induction.

The next year the rules changed and allowed 360’s.
No issues with those.