To complete the discussion listed below are the cost of the parts that I'm planning on using to build a stout bottom end for the vortec.
All prices in US$
J&E pistons 120.56 + 26 for thermal barrier
Crower rods $1158 for 6
Darton sleeves $737
Bearing and rings will add $300.
I'm getting quotes for machining the dry bore walls for the darton sleeves this week and will post.
The head work is limited to changing the valves to inconel, doing a bit of porting on the exhaust side and installing heavier springs. I don't plan on a valve job unless needed as the head is low mileage. Just a quick hand lap and done.