Steering couple not reaching

If/when everything is put together correctly, the wheels will be pointed straight ahead and the master splines will all be on top, coupling, steering gear, steering wheel and all, where they can be seen.
That roll pin hole will be vertical on the engine side of the coupling so to drive the pin in. That header might make it more difficult.
The fault occurs at the pitman arm. It will go on 4 different ways, thus it should be the final connection at most shade trees, gear box centered, everything straight ahead, as if on assembly line.