Another update:

ARP studs arrive, nice quality as always from ARP. Let they said only 1/2" of course threads. Due to the 1/2" length, the amount of threads into the head is about 2 threads less than a factory bolt. Not something I'm comfortable using, so I tried the Trick Flow Studs since they are 5/8" course, which is adequate, but since they are only 2 1/4" long, it only leaves .120" for a nut, which isn't enough IMO. So for now I'm just going to use the factory bolts. So if anyone happens to run across 5/16 studs with 5/8-3/4" course threads that are 2 1/2 - 2 3/4" long, those would be idea for this and please share as I'm sure I'm not the only one that would buy a set or 2.