Personally I would save your money and get a set of GT-40 irons. Have them fully ported with bigger valves and get a good intake with a decent cam like the Crane Compucam 2031. Look at my sig. I run high 12's untuned, with ported GT-40's, stock intake, stock throttle body, stock bottom end with 128,000 miles on it and a stock cam to top it off. When i get my 2031 cam in this week with my intake it should be deap into the 12's for a fraction of the cost. Also those times are on a full weighted 87 GT on slicks.
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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
Visit my site at:
http://www.geocities.com/cobrar93_2000/MyPage.html