Turning radius

Start with the box. Take the pitman arm off and turn the box lock to lock then turn it back half way. See where the coupler flat is located. should be straight up.

Put the steering shaft on with the flat on the steering wheel end straight up. Then install the steering wheel straight. Now when you apply the pitman arm on center, the wheels should be straight.

Many times I've seen this and it was the pitman arm not splined correctly or the wrong one installed. You can force the coupler or the wheel on at the wrong placement . This will screw the turn radius up and also the car will wonder due to the box not being on the high/tight spot on the sector shaft.

I am not saying this is what is wrong but just something to check and the procedure to do it.