Unfortunately that's not easy to come by in our lovely regulated state of California, however, I've run old engines on unleaded for a long time and they don't run poorly at all, the wear on the valveseats increases a bit bot not enough to cause panic, I'd get the 3angle valvejobs within a few years though to make sure it doesn't wear too much if I drove it daily. ----- Original Message ----- From: <Antiquefox@xxxxxxx> 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