Now that I'm not sleep deprived due to my wonderful new puppy, you will have to stick with 44 components or have custom inner shafts made. The differential on the 150 is roughly 2" further outboard than the 250/350, that is how they have room for the lower ride height. This also means that the inner shafts wont work. So, you will need to run F150 inners with F250 stubs. I know I used F150 stubs in my 250, but I can't remember exactly what the difference was, I knew it worked, but wasn't right.
A possible fix for that would be to find a 70's F250 closed knuckle 44HD, it uses the same 1350 joints as the D50 does, and have it's shafts cut to legnth and resplined. However, I don't like the idea of having custom axle shafts, and since I know you are not planning on putting 40's on and wheeling it, 44 shafts and joints will live just fine for you.
For the most part guys are relocating the lower ball joint for camber correction, but, this guy did exactly what I was thinking, with a 50, but made the drivers side beam longer rather than otherwise address the axle shaft legnth issue:
http://www.dezertrangers.com/vb/threads/156112-1993-Ford-Ranger-1-ton-Trailrunner-Prerunner
This is the solution I was thinking of for modifying the beam to suit the knuckle:
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The lower section is from the 50.
And, for giggles, the 50/60 hybrid:
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