He got the heads years ago at a race car garage sale and never bothered getting the info from the guy, then when he took them to his machine shop to see about a build with them on a 440, his machinist said no way on a 440, so there they sat in his closet , fresh built and never run. Since then he has always run Indy heads on everything.

I was thinking 540 or 572, but now thinking 572. It would be nice to know who done these, but either way, as mentioned, they should make some good power.