I had good results with AV gas in my first Cobra. 496 Chevy 11 to 1 engine/ alum. heads. I'd add one ounce of Marvel Mystery
Oil, per gallon and had good results, even when using a 100 hp dose of nitrous. I'd read that the MMO helped lubricate the valves when running AV gas. My 2¢. BTW, smelled great and turned the insides of the exhaust exit nice light grey. Just like de ole daze.