I've done the "searches" and must not have found the appropriate thread. I'm still confused, are there roller lifters available for pre roller block 351W's (mine is a 78 truck motor) that don't require the use of a small base circle cam? I've read and heard about the crane retro kit but it requires the small base circle cam, and it appears to be nothing more than the lifters, h-bars, and spider assembly from a 5.0. Those components I already have. Help me out if you can. Thanks!