In case anyone's interested ... the STS Machining bracket doesn't suit the earlier-style (Saginaw?) power-steering pump.
I'll attach a picture below of the pump that the bracket DOES NOT work with.
STS recommend using the factory no-AC bracket for installing those.
Now ... does anyone want an STS non-AC bracket for a late 240 PS pump? ?
The pump which the STS bracket doesn't fit: