I've seen .030 differences in valve lift on both T&D and Harland Sharp BB Mopar single shaft systems due to variances in the valve lift by the rocker arms, not from the cam lobe varying in lift
Stock Street Hemi rocker arms are the WORST I've seen so far, .130 lift differences at the valves using the same cam, lifters, heads and checking valve springs set at zero lash one of the many reasons I call them motors Hemiroid motors