I've used av gas from the local airport and they call it 105 leaded. I add one ounce of Marvel Mystery
Oil per gallon, for a little cylinder lubrication, and have never had any problems in either my 10 1/2 Rat or my 12 1/2 destroked 400 SBC. Up until the last year or two, I used to be able to drive the Cobra up to the pump but now I have to just fill a can. Guess the tax man was afraid he wasn't getting his pound of flesh.