Head Gasket experts...check in....

A body said

Interesting theory JBirch.... the only part I’m waiting for is “the rest of the story” on what correction you made and how it never happened again. I personally have a hard time finding the gasket totally at fault in this case, but maybe.... in this day and age and with aluminum heads I’d a had a MLS gasket on that from the get go.

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What I did was throw the home ported "J" heads away, they leaked like a sieve, they were junk. My fault, a lot too vigorous with the carbide and I bypassed pressure test, live and learn.
Next thing I did was buy a set of ported Eddy's.
Next, I set my intake up on a Bridgeport and took .075 off the bottom for clearance; no more problems
Using a Fel-Pro gasket, don't remember the number, didn't write it down, 11.3 to 1 comp

It's with a "U"