In my pile of parts I have Saginaw, Federal, and TRW pumps, all cores except the Federal pump I just went through. As far as I recall the Federal pump came off a big block many years ago. My Saginaw and TRW pumps are probably a mixture of big block, small block, and slant.

Now for the problem. I have the funky two piece bracket setup that I thought was Federal, nope it's TRW. I also have the two-piece big block TRW bracket setup and the one-piece big block Federal bracket. The Federal bracket puts the pulley I have in line with the second pulley on the crank, BUT I'm going to be running AC. It needs to match up with the third pulley. I'd rather not have to buy more parts, but if I have to...

So, is there a different pulley that work with the Federal bracket/pump that I have? Different bracket?

If I have to go to one of the TRW pumps, how do I identify a big block pulley?