360 build ????s

318 heads and J heads can use the same size springs, the valve size difference is only the head diameter, lengths are approximately the same. a .484" lift flat hydraulic lifter cam does not need double springs. now do not just throw the outer springs from the J heads on the 318 heads, they will probably be too weak. and the double springs may need to have the 318 heads step cut for the inner spring and may be too stiff for the cam. can u tell if the intake sides of the J heads have been cut so the intake will fit?