Also the 4.10's take you threw the trap at about 5600 or more right? before you went threw lower, the more rpms the car turns over 5400 or so your just losing power. After my new heads it really helped my times. I gained 3 mph and .5 after just GT-40's no intake or anything else. So that could also be why your slower.
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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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