One thing I will say I'm not thrilled with, which I see with BBM heads pretty otten, is the chambers extend out beyond normal head gaskets. My recommendation would be to use a Cometic 4.500 at a minimum to be sure the fire ring is clear of the edge of the chamber.
Remachined seats
Remachined seats & blended bowl
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads