Regarding the A/C brackets you'd probably do good fabricating (or having a custom shop fabricate) your own bracket. True 292 A/C brackets are about as common as hen's teeth. And the 250 bracket will NOT work with 292s because they mount both on the block and the head.
If you're a welder you should be able to modify the 250 bracket and cut and add a piece to extend the engine mount point of the 250 bracket to where you can bolt it on a 292. Shouldn't be too difficult.
The 250 power steering bracket and pump should be a direct bolt on.
-magic mike-
