Re: Rare pulley
That I do not know positively.
I gave my collection of brackets, original fasteners, pulleys and other stock Chevy parts that I had removed off of many cars that I have built over thirty years (hello my name is Big Dave, and I am a pack rat). It cleared out a full car bay piled about four feet tall. I gave him these parts, as he was busy restoring four cars and and an old truck and I couldn't bring myself to take those parts to the scrap yard (which is why I still have three third gen Camaros out behind the barn, plus a Nova, two Suburbans, and a Mercedes Benz Convertible).
The person I gave them to promised to cherish these parts, though I doubt if he has the room to store them that I had at the time. He was building an L79 1966 Chevy II clone based upon a documented, all original L79 '66 Chevy II SS car that he already owned as a father son project (neither car had A/C or power steering). He also had a 1953 pick-up and his 1958 Corvette up for a frame off restoration. I will tell him what that part is worth to see if it motivates him to rummage through that pile of parts in search of one which may or may not be in the pile.