Got an e-mail from Nordin today.
He still can't post.
He sent this along:
Hi Gerald!
There is a post at iboat about head Chrysler 1967 75Hp.
Answer that there is a simliar post egen Frank A explain about this.
Early 3cyl. had a head with a cast watertube newer head was modified with a waterjacket cover plate at the head. This mod gave better cooling around the plugs.
The headgasket that is available now fits both but the early head use 3/8 bolts and the later 5/16.
So you have to make the holes for the bolts in the gasket a bit lager.
Best regards
Nordin