These parts were sold across the counter as service parts as late as 2001 (they may still be available at GM for all I know).
3829387 Pulley, 302 thru 350 with special high horsepower (W/SP/HP) 3 5/8th inch Dia. 43/64ths shaft dia. Single groove deep 1/2 inch wide.
3770245 Pulley, Water pump, 1963-69 Corvette W/SP/HP, '67-'69 Camaro W/302 engine; 2 grove, deep groove (small hub 5/8th inch shaft) 7 1/8th inch diameter.
3720616 Reinforcement, water pump pulley (3770245 small hub 5/8th inch shaft)
To my knowledge GM never had a special deep groove BBC crankshaft pulley using the standard small diameter three groove pulley instead. These numbers are for a short water pump driven at 75% of crank speed (Note: BBC water pumps have a 3/4 inch shaft so the pulleys for SBCs need to be bored out to use them). Moroso and a host of other circle track vendors make a number of BBC V-belt pulleys which though admittedly not concours original but they do have a wow factor of their very own. Only the L-88 427 in the Corvette had deep V-pulleys, and they were uncommon back in the early seventies. You will probably have to go with aftermarket chromed steel or billet aluminum from March or Zoom.
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