I grabbed the entire hydroboost setup off of a 2001 gt (aside from the proportioning valve). was going to just plumb it to my existing proportioning valve. its been sitting in my garage for about 10 months though as I hem-haw around actually putting it in though as I'm going to do a volvo electric power steering pump conversion as well and trying to decide which to do first. I have the gps pod for the volvo pump so it'll operate instead of in limp mode.
I think I'm about at the point where I have convinced myself to put in the volvo pump first but then I have to either fab up an idler pulley when I pull off the factory pump for the belt...or I'd have a really really long portion of belt just flapping around. people say there is idler pulley available online but I have yet to find it.