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Mike,
There was a post on june 10 by Morky, about ID numbers and he got a reply that list numbers for 70 to 81 according to them you have a 70-74 302.
As far as the pully for the water pump, what I meant was that you should get a complete set from a non-power steering engine. The 226 pulley would only work if you have the same pulley as I have. My crank pulley is a duel pully with the outer pulley bigger then the inner pulley. And it isn't a perfect match there is about a 1/8 inch misalignment between the pulleys, but I want to get my truck back on the road so I'm going to live with it.