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I've been going to Bonneville Salt Flats for years and I also road race. Lot's of blown motors when your trying to run an engine at WOT for miles.

So many years ago I show up with a 6AL MSD and...

Older heads like your 1980's I don't think have the modern combustion chamber shape to incorporate high swirl/fast burn technology.

There are only a couple of things that can break pistons like...

I've built a couple of 3.875 strokers both a 415 and 421.

I've seen pistons broken like you described. They were in race motors that experienced a lean out or way to much spark advance which...