Stock timing is around 10 deg. or so. I run 18 deg. of timing on 87 octane and run 12.9's with no problems. Bump the timing back down and you can use the lower gas. You shouldn't notice a HUGE power lose but will notice a differance. I don't think he knows what he's talking about on the intake thing.
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87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's,GT-40 heads,long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's.
Best time 12.96
Best MPH 103.42
Best 60' 1.695
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