Looking at your picture, does the tire rub the aft end of the drag link? If so, one option would be, if there is enough clearance between the pitman arm and frame and steering box and exhaust manifold, would be to move the Box in(closer to the frame) one bolt hole, if that would help your problem?

Ed

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.