M-code A-body question

The later 440 blocks with two bolt holes were used for the power steering pump brackets. About 16 years ago I paid $415 for an original bracket, only ones made were the ones that came on the cars. Finding all those m-code specific parts is like a treasure hunt gone bad. I picked up a set of manifolds that the original owner had driven 13 miles then put on the shelf, cost me $4500.