How to remove PS box

Almost done, but now I've got the problem where the steering wheel spins to the left when not held.

I followed the tip in this helpful article to lessen the effect:

A body Power Steering "self turns"

But after loosening the 2 1/2" bolts and bumping the block up toward the firewall as far as I could (it doesn't seem to move much in either direction, maybe 1/8"), the wheel spins less violently, but the car is still not driveable. I think I've got all the air out of the system (no froth in the fluid). What else can I do? Is there maybe a passage blocked inside the steering box or am I just not aligning or moving the block enough? This sucks after all the work I put into it.

-John