Power steering diagnosis help

[mister.freeze]

Gearbox in and hydraboost replaced. Stiffness is gone, but not as loose as I'm used to. The pump whines like it's low on fluid some now. I'm guessing air that has yet to work it's way out. Maybe back off the top bolt a quarter turn or so? Also, best method to clock the steering wheel?

Note: my 18-year-old receipt with part number translated to a gearbox off an '86 Silverado. Smaller input shaft required a $60 coupler (rag joint). The return fluid fitting had to be changed too. Otherwise, bolted up as it should.