They look like they’d work pretty well....... but these days with what else is on the market, and considering what they can be bought for, vs what you’d have in parts/labor/rockers on those 6’s....... they’re certainly not going to rank very high on the “bang for the buck” list.

But....... you’d have some pretty unique pieces on your motor if you were running them.

Do yours have the deep spring pockets too?

Looking at the chamber pic some more, I see that head still uses the grossly undersized seat rings.