I don't see how the SBM runs as well as it does with that misalignment, especially at high RPM. R blocks and Ritter blocks have the lifter bores at 48 degrees which is perfect. A line drawn through the cam centerline and the rocker adjuster cup is a 48 degree line. The 59 degree lifter angle was a hold-over from the 318 poly block. I guess Chrysler didn't have enough money or time to get it right.