Yes, you can use a hydroboost unit with just a power steering pump.

I don't see any reason the 3500 unit wouldn't be adequate for your truck.

Your 51 is probably lighter and designed to go much slower than what a modern 1 ton truck.

Here's some good hydroboost articles.

http://www.gmfullsize.com/forum/showthread.php?t=156800
http://classicbroncos.com/hydroboost.shtml
http://bangshift.com/general-news/t...-on-your-classic-gm-muscle-car-or-truck/


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket