Those were mine, Mr. P, not the O/P. I posted them up just for comparison since he was unsure of what he has. Clearly someone put some work into his heads for whatever reason, hence the confusion.

Originally, these 576's were OTC replacements for stock-type heads. They were available around 20 years ago and only for a short time before the Magnum stuff took over. It does seem a little peculiar that someone would go through the trouble they did with these things, especially if they were for some type of limited class racing.

Mine are essentially the original configuration of what he has. The caveat here is that Mopar DID offer ported versions of these heads with 2.02" intake valves (as opposed to 1.88" like mine). However nothing in their nomenclature or descriptions says anything about milled rocker shaft stands.

Hopefully that all makes sense...