Is this a new cam lifter set? How do you know the lifters are "pumped up" If you ordered a set of lifters, cam, rockers, and push rods for a 440 you should be able to bolt it all up and go. I've never heard of anybody trying to set the lash on a hydro cam w/ stock rockers. Are you trying to use some 66/67 push rods? DO NOT OVER TORQUE the rocker shaft bolts and make sure the oil holes in the shafts are facing down.