Dear Hoppy,I have a friend that has a Corvair that he runs strickly on aviation gas. If I am not mistaken, he ended up burning a valve. I suspect a mix of pump gas premium and aviation fuel would suffice.
100 octane leaded would be best. If your gasoline is unleaded like ours you will have to search for an additive to compensate. If you don't you will probably end up with a burnt valve. No Worries Mate.
Bob Becker
76 NYB, 81 IMP on the trail of a healthy 82IMP