I guess I'm a little confused by neonova75. There is a definate differance from old Chev 6's to the 194-292's inside to outside on the pulleys.
When I'm not using a stock water pump I go to the late stuff for my early models. I've used a stock 8" V-8, Fluiddampner, Fishers, and currently use TCI Rattler which I found to be the best for me so far.
One time I did press apart a stock water pump and removed the pulley; then put on a standard electric motor pully which lined up with the pulley bolted on the late model dampner and it worked fine.
So far I've never had a problem with V-8 dampners on my Chevrolet or GMC 6's............Good Luck

216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later