Every GM truck I have owned had the power steering pump located on the drivers side, below the alternator, pretty low on the engine, small block and big block, even the 6.5 diesel had it mounted there. You should be able to use factory junk yard brackets and pump to put back in business.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy