i going to run around 10:50 and the car will see little street time
mostly strip and the machine shop suggested always using
racing gas to be on the safe side, can you add octane booster
to the 95 octane or does that not work? going with a EFI system
Where are you living that you have to use race gas for 10.50 -1? Or maybe I should say soemthing against the advice you were given but he built your engine so he may know lots about it that I don't.
I don't have a street performance engine out there running on 92 octane from gas pump that is not at least 10.50 -1 and a few that are 11.25 -1 compression. Iron Head BB Chevys, Mopars, and Fords that are 10.60 -1 compression. Iron Head SB Chevys at 11.00 -1 compression and aluminum head SB Chevys at 11.30 -1 compression that work just fine with 92 octane gas pump gas.
Of cource there is more to it than just compression ratio. The complete combination needs to be built for it and be compatable. If you have hot spots in chamber or on piston, or a tight low overlap cam or extremely heavy vehicle, That could all make a big difference as well as if you have a large quench distance clearance. I have SB engines with 11.00-1 compression driven on 92 octane that go for 100,000 miles and farther with good gas mileage on the road.
You can do much more in camshaft with an EFI engine too.
Ed