I found this cam in Compcams catalog, it lists it for Speed density EFI 460. The specs are Duration 256 int 268 exh at .50 212 and 219. Lift is .490 int .495 exh and a lobe seperation angle of 114. I have an '89 F250 HD w/460 and C6, w/3.55 gears. so far only headers and K&N filter, am also considering custom chip. Has anyone any idea how this would work?