Chevy BB 14023155 W.P. Pulley Crossover
 

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Here is what I would like to know? I have several old school BB Chevy pulleys where the part number starts out 39-----. seven digit, 70s and older. A buddy is putting Vintage Air on his BB long water pump engine. He says that the crank (14025185) crosses over to the old 3937787 AC. A 3 groove pulley with the outer pulley a larger diameter than the other 2. The water pump calls for 14023155. I have a/c water pump pulleys, just not that number. This particular pulley has 2 grooves with the inner pulley a smaller diameter. Is there a 39----- numbered equivalent pulley? Could I use a 2 groove same diameter pulley in place of the one called for? I'd rather use what I have lying around if possible. Thanks. sYc.