I have wondered alot which lower radiator hose I can use if I used a stock 4.3 radiator. Well, with complete access to Napa and the line of hoses they have, I grabed a few hoses and found ne that works. The Napa part number is 7674. It is a lower hose from a 70's slant six Dodge truck. I cut out what I needed. Worked awsome. Used some stock spring clamps, and everything fits great with the stock 4.3 radiator and stock LS thermostat housing. Ceck out the pics below. Figured thi would help out with some trying to plumb things up.