I am not too certain that the PS Van chassis and pump will work well for me as I am going with the IDI, I do have some lines on the Saginaw pump I'll be using for the swap. Mostly I need a pump with will physically just bolt into the stock pump location and have a pulley I can use.
My Saginaw pump I have, is from a V6 (COUGH) Chev

van that had Hydro assist brakes as well. There is not a fill spout per say like normal Saginaw pumps. This one has one large line in for PS fluid in from the remote reservoir and one high pressure line out and what appears to be a small return line as well. The return line goes to the remote reservoir so this will be a nice setup once completely rebuilt and installed. I may even take and convert both the "pump" can and the remote reservoir to AN fittings so that I can use some nice braided stainless lines for added durability and a touch "O" bling bling

I think as the new kids say