Dennis,
My pulley is a cast/machined affair, but the engine that I saw for car #760 was a standard two sheave small block Ford piece for 1965ish,****CORRECTION 4-1-16! THIS IS WRONG! 760 HAD THE CAST WATER PUMP PULLEY WITH TWO DIFFERENT SIZE SHEAVES**** same for the crank. Not sure why DeT made their own.... When I pull my engine out next, I will certainly see what the dimensions are in relations to each other. (Ford pulleys to DeT version)
SOME CARS got steel FORD crank pulleys, with two unequal width sheaves. I believe these were 65 Mustang with power steering. However there was never a water pump pulley made by FOrd that had two UNEQAL width sheaves!!!! (All were same width...for two 3/8" belts.)
Steve