I just purchased the car and i have been told different things. Some say low octane 87 or 89 and others said run 94 if you can.
The best fuel to use for an older car like that is high grade. Use 94 octane, if you can get it. Also, every four (4) fill-ups, you should add lead additive. In 1969, there was no unleaded gas and these cars need to have lead added to them for the best performance. Trust me, if you use low grade, unleaded gas, you will start to experience problems within a few months. I have had some older machines (having grown up in the 60's and 70's) and they just don't build them like that today. By the way, congradulations on your new toy.
Ok, I'll tell you the answer. It just depends on your engines compression ratio, since its a 69 it should be around 9 to 1. In that case you should run right at 89. If you put 87 octane in it you won't maximum performance if you have around 9 to 1 compression, if you put super high octane like 93 and up, you will just be wasting your money. Unless you are running serious drag motor running on around 12, or 13 to 1. As far as additives, its its older, get the sea foam product. It comes in a silver tall can, and you can pick it up in alost any parts store.
