gettng ready to buy some new pullys for the engine. besides what a pre 69 bb is supposed to have, how can you tell if you have a long water pump or a short one? what does each measure from the block to the back of the pump?

This link from Dale's awesome website will answer your questions... :thumbsup:

http://www.chevellestuff.com/tech/water_pumps.htm

perfect! thanks bill