there use to be more in the FAQ on this but it was gutted. they had this part under motor mounts and it is the rear support bracket for the pump.
http://67-72chevytrucks.com/vboard/s...d.php?t=609833
here is another which will show you the setup
http://67-72chevytrucks.com/vboard/s...d.php?t=633432
ron