Where can I get a serpentine setup?

[jackyl9999]

Ive got to figure out a way to get a pulley set up for my 70 gmc. It has a 350 with heads off a pre vortec engine. The engine is new to me. Ive looked in jegs and summit and I need to find something cheaper than what they have. I plan on running a/c and it already has a water pump on it. Could i make something work out of a junk yard? The pic I have of the engine is not the best angle but the truck is 40 miles from here so this is the only one I have.
thanks for any info or ideas.