Saginaw boxes in GM trucks are outside the frame, pitman arms mounted for: fore and aft movement or left to right. One is 4WD, other is 2WD. No kits available as far as I know. Might have to weld additional mounting ear to frame for all 4 Saginaw mounting bolts. Use GM pump, must fabricate mount to engine. Move steering shaft to hook up to Saginaw, 2 u-joints required, mount for bottom of steering column. Scout box can also be used, mount on top of frame, pitman arm must point fwd, place(?) in TX can change guts to mount other way. Saginaw boxes historically crack frames on modern GM trucks, might want to reinforce frame while in there. Use 3-corner file to remove skip-spline to orient pitman arm where necessary.

'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.