I know 67 BB power steering pretty well, as I converted my SS to power recently. The water pump runs off a single groove pulley. This pulley has a big cone on it which sets it back from the water pump shaft about 3-4 inches. The first groove in the crank pulley runs the water pump pulley and the alternator.
Stock 67 BB power steering is designed to run off the "3rd" groove of the crank pulley. It will not run off the second! There was no one piece triple groove crank pulley as far as I know. Instead, a third groove pulley is bolted on over the main crank 2 groove pulley. It will probably work with a single groove crank pulley, but I've never done that.
This "3rd" groove pulley can be obtained used from Hemmings or try Sloan's El Camino and Chevelle - 760-949-6724.
I bought almost everything else from Ground Up, our sponsor. There are many instalation gotchas in this job - write me for details.
As for your header question, I have no idea. Is there some sort of clearance problem? Are you running a big block? What do you mean by engine stands? (motor mounts?).
Billb is right. Big Block PS is different than small block. What are you running?
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Jameel Qazi
#'s 67 SS