If you're going to build a set, you might consider using the '93 Cummins motor mounts. They are significanly bigger cross section and include the interlock tabs.

I put them in my '77 Ramcharger the same time I was installing a 203/205 doubler with a custom trans (transfer case) mount. Because it moved the engine up about 3/4" I went ahead and installed a floor shifter as the column shifter linkage pivot no longer lined up. I could have adjusted the column shifter if I wanted but I needed an excuse to install a Turbo Action Cheetah shifter