Reply to "Proper fuel for 71 high compression"

In the late '60s & early '70s, Sunoco sold 102-octane'Super' at their pumps. Most guys with 11:1 engines have pulled the cylinder heads & replaced the steel-shim head gaskets with modern fabric-composite gaskets that are thicker & drop the C.R. to a more mamageable 10.2- 10.5:1. Remember, while your engine may be very low mileage, the castings have had water in them for 32+ years, and most ownerse STILL don't change anti-freeze every year. As the antifreeze additives are used up, corrosion begins- usually on the steel gaskets and steel freeze plugs.
Adding to this, an aftermarket cam, hydraulic or solid- your preference- with a little more duration & lift will further reduce the internal pressure in the cylinders. This usually results in a more driveable engine with more horsepower, that runs fine on 92 octane with no additives. Being forced to use additives in an engine to keep it running is to me like being on drugs....