at the shop I am putting my 430 together at they have several 632 chevy big blocks with the 180 offset rocker - the one just made 1350 hp with a procharger before i put mine on the pump - so i know they work.

Small block mopars have a crazy angle to the pushrods to begin with - i doubt there would actually be much side load to the lifter since it;s pretty tight in the bore - but thats just my opinion.