First off, whom ever did the power steering conversion should have just installed an original 73-75 Bronco system in it. They are the cleanest and probably the most reliable systems to go in. Saganaw boxes are pretty strong and if memory serves me correct, I think that is an F series installation. With any other system you decide (F-series, Toyota, Scout, etc.) that you want, there is always a fabrication issue involved. If you are going to change the steering system out, then do a google search on "Bronco Power Steering Conversion" and you can get quite a few good write ups. I have never done an F-150 conversion, but have seen them. The box & pitman shaft hang down about 3 inches lower than a stock system, but they are good. You just have to do your homework to get the right set up for you.
What kind of problems are you having with the steering to make the other guy say it needs to be upgraded?
As for your tires vs. engine capabilities, you have more than enough engine to turn big meats. The only problem that I see is that you have real high compression and you gotta keep the RPMs up. Climbing is a different sort of animal because the more speed you use, the more things you are going to break. If you hammer it right off, with a 39" tire and the amount of hp you are probably developing, you will be going through axles and u-joints fairly regular. I might think about de-tuning the engine or getting a different set of heads to lower that compression to somewhere in the neighborhood of an 8:1 or 9:1 ratio. Where you are sitting, 11:1, that is racing territory.
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