It's running fine so far. I thought once when I was hammering it on the expressway and I was next to a wall that I might have heard detonation, but I haven't been able to reproduce it, even in hotter temperatures. Just to be safe, I'm using 94 octane gas until the weather cools down and I get my new radiator.Matt's right about the belt-I did replace my stock JR belt because it was glazed from my defective tensioner so I think I could have used it. I didn't want to have any chance of slippage which is why I went to the smaller belt. When I did put the slightly small belt on, it was real tight so it will probably be good when I go to the 2.3" pulley.
Matt, how is your car running in the hot weather?