** Update ** Over the weekend it appears that I got this problem squared away. I wish the problem was as simple as having the center link reversed or flipped or a bent part, as some had suggested. However, that was not the case.

What I did was obtain another new pitman arm (third one) and replaced it. Also, I shimmed the top bolt on the new steering box. Not sure if the shim was necessary however, it appeared to add a slight amount of clearance and it doesn't seem to affect anything so I left it in when I re-torque the steering box. The new pitman arm was Moog same as the prior two, new ones. Comparing them side by side, and taking some measurements with a caliper, I could not find any significant difference. Apparently, Moog sources these parts from other vendors since none of them had an actual Moog part # as far as I could tell. All I can say is upon reassembling and torquing everything back up, wall'la no more interference!

Anyway, thank s for everyone's help and suggestions.