thanks to all who replied. turns out that Flow Kool makes and aluminum version of both early water pumps. i'm using the one with the cast in impellor housing and steel backing plate. it matches my timing chain cover, is the same from flange to hub, and the inlet is on the passenger side. i'm using the 50 oz. universal balancer from ford motor sports. according to the folks at ford all my pulleys and brackets should line up. i now have all the parts and hope to find out soon.