I took calculation data from the head based on the flow bench data i recieved and calculated cams and such.. the follow cam combinations are the best setups for this head utilizing 80% ratio for exh/intake. The cams start from the biggest and goto the smallest. 252 @ .050 @ .453 duration intake cam paired with 220 @ .050 @ .373 exhuast cam. Projected power output with good exhuast and intake is max horse at 8400 rpm at about 234 at crank. 244 @ .050 @ .434 intake cam with stock exhaust cam (76.3 ratio closest i could find) realizes 224 horsepower at 8200 rpms 236 @ .050 @ .413 intake with stock exhaust makes 217 or so at 8300 hundred. 228 @ .050 @ .393 with stock exhaust cams make 211 @ 8100 and i dont recommend using any smaller cams then that on the fr head because the ratio will be way off and you wont have good solid lowend torque or high end power. i must also say that these reading were taken with a 10 inch long intake runner and 12.5:1 compression ratio with the cams set 5 degrees in advance. These are all constants. now with our huge 23 inch stock intake runners those numbers would be dramatically diffrent. However the ford racing intake manifold would be a good manifold to compare to this length. These numbers if you have the fr will be close.