My power steering set-up for my Camaro came off a 69 396 Impala station wagon, which I'm fairly confident had never been molested. [no, it did not have XT wheels!!
]It was 3 piece, with the little L shaped bracket that attaches to the exhaust manifold bolt, and the cradle style bracket, not the later 2 piece set that is still available from GM. (Also had the p/s return line on the side of the pump reservoir)