We had an OP who made removing and reinstalling his manifold bolts a periodic maintenance operation.
I used to buy little gadgets called "Pass Master" (nothing to do with Hockey) that was a micro switch inside a plastic chamber with a metal diaphragm. When engine vacuum dropped below its design, it opened the circuit to the A/C Clutch. There were 4, 6 and 8-cylinder "flavors."
As I've looked at 454/460 discussions, the 454 guys wanted more power and the 460 guys wanted better mileage. Might be that the 454 owners were more of a hot rod crowd.
