My 77 manual says 58/61 on the primaries and 72/72 on the secondaries, nothing about the power valve. The idle setting procedure is terrible (adjust mixture according to emissions control label in engine compartment).

The imagines just show an Idle speed adjustment screw, and mixture screw limiting caps on the secondaries.

The governor system is only in the carb and the distributor according to the manual, you should be able to replace both of those and be done with that all.