Rick,
I installed power steering on a 1966 C60 with a 292. I bought a bracket and pump off a mid '70s Chevy pickup at a local salvage yard. Since my 292 has an early '70s head on it(small sparkplug), I felt it would line up better.
I still had to engineer the bracket so it would fit over the exhaust manifold and line up the pulley grooves. It mounts the pump high on the drivers side. I have not seen a 292 with both air and power steering. I find it difficult to beleive they would share a common bracket but then again I have never seen one.
Good Luck,
BigMac
Thanks Dan