There's a good chance that .510" intake lift will not clear your (stock?) piston dome during overlap.
The original rocker geo was not "valve stem 90° to the rocker pivot axis @ 50% lift", and selecting components or making adjustments to achieve this is contrary to GM engineering.
The shaft center is located below this point by about 33-50% of lift to reduce scrub and extend stem tip and rocker pallet life.
A common remark "proper geometry places the rocker arm pad exactly in the center of the valve stem tip”. Not important, not a valid goal.
