I used Earl's fittings and hose from
www.amstreetrod.com. I used -10 perform-o-flex ss hose, with 45 degree and 90 degree swivel seal hose ends. At the water pump end, I used -10 to 3/4 pipe adapters, and I used 1/2" (AN 5, I think) tubing adapters silver soldered to the heater core at the core end. Worked pretty slick.
BigMike