It's not the lifters... it's the block.
The blocks were machined poorly, castings poured with rough tolerances.
The lifters bores you have an issue with, may not be in another block and the other might have problems with bores that yours fit fine.
All part of hopping up 35+year old stuff.
You'll need a cam cut with a smaller base circle, which is not uncommon for SB mopars. Why the manufactures don't do it from the start...
Call Brian at Indio Motor Machine 760-342-2178
He had a smaller base circle cam cut for me from Comp.