Just curious here, but the GMC rods are not known for being weak. I just put a set in my 261 chevy. Some come with .990 pins. So the question I am asking is why the push for offset grinding crank work and after market rods. You could go with the stock 302 rods, they can be rebuilt, big block chevy arp rod bolts are what I used I think, forged pistons from ross or venolia. Then its just a matter of grinding the crank and indexing the throws, sorting out a compression height and ring package for the pistons. Cam shaft, Why a billet roller? I am pretty sure roller lifters for a GMC are pretty expensive if you can even still get them. You could have schneider cams grind you a flat tappet cam that would be to your specifications. A little head work, some decent headers, intake and carb package, you should have a relly good runner, no?
