Some parts arrived today.... the ARP head studs are a perfect fit and a purty sight on a 3.0L:

Tested the fit on the heads - no interference issues:

Unfortunately, the DOHC 4-bolt main studs are smaller than the M12x1.25 main bolts used on the 2-bolt main blocks, plus too long - maybe I can find another main stud that will cross over:

The rod bolts appear to be a good fit, although, there's no turned down guide post end that can be used for a hammer or drift pin striking blow when removing pistons - not a big deal since I usually use a wooden hammer handle:


If nothing else, the exercise was worth it to find out about the head studs - that should eliminate some issues for those that are willing to pay the price of admission.

I sure hope I can find a main stud that will fit.

Frank