Jeff please send pics!
You could theoretically do that but you wouldnt pickup any more oil than the 534 itself. It has maxed out the port and the hole size at .704" which is .079" larger than a -12 AN fitting through hole. You could however drill out the -12 to 1/2 hpt fitting to .625 so their is no bottleneck. Our info suggests that the pump cant pump any more volume than the 534 allows unless major pump cavity and gear work is done.
Here is a pic showing the -12 adaptor being drilled out
