The Downey mount only goes back into the frame 1.25 to 1.5", your frame is cut back atleast 2". You could weld-in a scab plate behind the Downey mount.
Also look at my P.S. Hose Kit, hoses make an immediate rearward turn and just skim over the top of the frame--below your grille panel.
You could use the larger diameter of my steering shaft on the bottom, and the actual length of the larger O.D. (slip-yoke portion) is trim'able to any length you desire (shorter or longer).
The downey hose kit make a nice instalation. I am glad to see they are still available!