I think if you could spray a little water injection it would help out cooling, give more boost and help it say just a bit cooler. I son't see how any stock car withstand much more performance without getting hot. Put in a 26x19x3 in chevy racing radiator, 2 core and your problems go away. Then put more boost in it and not worry about overheating, which means BHG.
The higher octane will not help you get any better fuel milage. Timing and good airfilter and higher tire pressures. Bump the timing for several degrees with higher octane and your milage will improve.
Good luck
Russ
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