ARP Main Studs & Main Bearings Questions

It is overkill. It also allows oil to get to the rod bearings 100% of the time instead of 50%. So, if you run full grooves and like larger clearances, you should have the volume to keep the pressure up with those bigger leaks. I am not a fan of full grooves. I like 3/4 best, stock style 2nd, and I run clearances on the tighter side with a high pressure releif spring and modified main feeds. Because the HV pump robs power, puts heat in the oil, and in some extreme cases I've heard it drains the pan. Never had that myself, but it's too well known to just be a coincedence.