Leaderboard

As others have said, the Dodge/Chrysler/Plymouth/DeSoto flathead sixes have hardened exhaust valve seats from the factory, and they are very capable of handling modern, unleaded gas without any issue. They came that way starting in 1933 or 1934, and remained that way throughout all years that they were produced, which was well into the 1970's. So you don't need to worry about that.

Moparpro is a great place to way overspend on parts. There is nothing special about him.

My 51's vacuum line is routed similarly, across the head, Ian has a 40? Odds are they changed it.