Engine Oil Pump Clearance

Granted the person you spoke with may not have had the best communication skills, he was basically right. When I installed my Mellings pump and used ARP main studs I had the same problem: The stud contacted the pump and you couldn't get a nut on. I had to machine the bearing saddle and spot-face the bottom of the pump, along with a shorter stud, to make it all work. This subject keeps popping up and I keep promising to post pictures of my lower end since the engine is still out and the pan is off.

Crappy attitude, but correct advice.