11 to 1 on pump gas

Had a friend and neighbor that had an original 11:1 DZ 302 Camaro (Iron Head).Used to run 93 octane and add 1 gal of race gas and didn't have any problems !! That's what I'll try first seeing as I'm expecting compression ratio to be between 11-12:1 !! Just bought 5gals of 100 octane race gas,$45 !!Let's see,16 gal tank @ 9.00 /gallon = $ 144 !!Guess I won't be doing too many road trips with Dart !!!