If I remember correctly, on my heads there is a letter P printed on the top of the head just beside where the valve cover would bolt on. In the top front where the accessory bolts are you should see the 'P' marked. At least my GT-40P heads are like this. Also, the plug angles are totally different on the P heads.
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'94 GT, 347 stroker, AFR 185's, Trick Flow stage 2 Cam, Edelbrock upper and lower, 70mm Tbody, 77mm MAF, 24lb injectors, 255 lph pump, underdrive pulleys, 1 5/8 Motorsport Headers, king cobra clutch, tremec tko, 3.73 gears, flowmasters
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