I found an old chrome one that I had kept because it wouldn't fit on the last small block I had - surprise it fits this one. Now, the bolt that came with the bracket kit is about an inch too long.
I need to get different pulleys too. The ones I've got are for an A/C car and this one isn't. There's no way to drive the alternator belt off the crank pulley alone. Pretty sure I need both crank and WP pulleys to make this work.