Keith,
I think I understad your layout (I believe that it is similar to my car. Anyway to make things simple for the routing of the bottom I put a hole through the lower crossmember and ran a pipe through it. I got the idea from Butler who took over Arntz and made a number of mods. My radiator end hose is a small "L" and the other end that goes to the Waterpump is a larger "L"
good luck,
Mike 'monster'