mine came off an explorer, and they are non p's, you might check into that, they are the same as the gt-40 on the cobras, but they will have slightly less compression unless you mill them to your liking, mine are about 63 cc with some light milling like .1000 or some crap. good luck.
oh yea, dont use the springs if you want to go fast, buy some aftermarket ones. 
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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