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If you aren't going to be on it, 98 unleaded with some 110 leaded mixed in. If you are going to beat on it, 100% 110 leaded or better. I run 98/100 mix in my L71 with no issues.
My LT1 runs fine. Depending on where you live (elevation), you might have to dial the advance back a bit. But if you're lucky to live in a rural area where ethanol free gas is available, use it.
My experience with additives is that they tend to foul plugs. Good luck and enjoy! I would test drive it to see if it actually pings before you buy it. If it does, it is easily remedied, but use it as a bargaining point with the seller.
jbsblownC5 is a Torco dealer here. Just picked up a 6 pack of "Acclerator" boost its 120ish
Stuff in the auto parts store is garbage. When they say "raises it a point" they mean 91. to 91.1 lol
VP or torco is the way to go