Power Steering Pump Bracket

Ditto. Your brackets are for the original TRW pump. O'Reillys gave you a Federal pump. A place that sells brackets (Bouchillon Performance?) has photos of both pumps. I went thru this on my 273 engine after changing to the later alum w.p. for which no TRW brackets exist, so I had to change to a Federal pump. If I did it again, I would go w/ a Saginaw pump since more efficient and available (aka Chevy).

For your slant, the best option might be to get the brackets from a junkyard Aspen/Volare slant. That gives you both a Sanden AC compressor and Saginaw pump mount, and real cheap. I did, and was thrilled to see a Sanden on a Volare slant.