[Salvatore]

You can keep your timing retarded a little and run 93 octane or you can run a fuel/led additive. I would run 93 octane and try to buy some Sunoco racing gas or even aviation fuel. Don't run your motor real lean either. VP is very good racing gas also. I have around a true 10.75 to 1 in my 69 Z/28 and I used 93 octane and some of Jack Podell's additive "Max lead 2000." It may or may not have helped but never had any pinging or detonation. I now run 5 gals. of Sunoco 112(all that I can get around here with lead) with about 6-7 gallons of 93 with about 36 degrees timing. Have your distributor recurved also for power and better timing adjustments.