Then I bolted the AC side of the adapter in and began aligning the York.  I used a straightedge as well as an old fan belt to line up the pulleys.  I used shims of wood on top of the frame rail to shift the position of the York.  This alignment is critical.  Here you can see the straight bit of wood I was using to line things up.
Once I had it in a spot that I liked, I just reached in and spot welded the York plate of the adapter to the box spacer on the AC plate.

Also, as you can see from the pictures above I had to remove the right side input flange and reverse it so that the York would fit.
After making the spot weld, I removed the adapter and finished welding it up.  I also added a second 2x2 spacer for extra strength.
Here's the York installed with the finished adapter bracket.
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