I had the armstrong steering on my 1 ton, and had no problems. Then in the process of a disc brake install I ended up with power steering too... And it's great, you don't know how nice it is till you have it. The truck was not that hard to steer before, but now with the truck sitting still I can put one finger on the rim of the wheel and turn lock to lock, no comparison.

If you are creative you can drive the PS pump off a second belt grove on the generator pulley:
http://rides.webshots.com/photo/1484182686080251109emAXqy

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-