If you want horsepower, save a little extra money and buy a good set of aluminum heads(AFR,TFS,Canfield...)Those would net you about a 70-80 hp increase with a good Intake(Holley,TFS,Edelbrock RPM)and a good lift cam. The GT-40P's are not good heads IMO. Look at the 93 Cobra, it only dyno's 255 rwhp, and with good heads, intake,and a cam, 300 is attainable. My dad's friend has your setup, but the heads were ported a little meaner, and it maxed out at 265 rwhp with a GT-40 intake. The P's will add about 30 hp, max.
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Dustin
1990 Saleen GTSport #14
TFS Street Heat Upper & Lower(Black), TFS TW heads, TFS 3/8" Phenolic Spacer, E303 Cam, FMS 1.6 Roller Rockers, BBK 70mm TB, FMS 70mm MAF, MAC 1 5/8" Equals, Dynomax Super Turbo 2 1/2" cat back, Bassani 2 1/2" Off-Road X-Pipe, MSD 6AL Ignition w/ MSD TFI Coil, Home made Ram Air, Racecraft Suspension
60ft: 2.158
330ft: 5.396
660ft: 8.271 @ 91.43
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