1969 340 water pump pulley
I bought a New Cat iron water pump from Moparmat2000 which is coming and That is probably what I will have to install. I just measured the 3614378 crank that came with the engine and it is 3 1/8 inch tall x 7 1/4 inch diameter. It is a double grove pulley.
I found a post from Chrisf from 13 mar 2011 for the following ad
"crank and
water pump pullies. matched set off the same
engine. 3614378 and 2951836 they fit 70-up non air conditioned small blocks.
6 7/8"od single groove water pump and 7 1/4"od crank. two groove. 3" deep on both."
We have established that my engine is for a 70 and up by the timing mark location ( I can't remember the casting date but it was 69).
I think I will have to install the alternator and crank pulley and see how things line up to know which one I need using the reference from the pulley ID thread link above
A lesson to all... Don't buy an unassembled car, even from someone who says everything is there, and don't buy an incomplete engine.