I want to thank everyone for their input.It seems like the steering clearance issue can be taken care of when that bridge is crossed,most likely with an extra shaft and u-joints.I just wanted to be sure that solution produced zero slop in the steering performance and seat of the pants driving feel.

One reason for me wanting to do some extra planning and preparation,is that I want to media blast and paint every component on the truck,including frame.I'm going to set the cab on a rotisserie soon and get to work on patch panels,floor repair,cab modifications,etc and get everything to a point where I can send it out to the media blaster,get it back and epoxy prime it.Once I swap the cab over to the modern chassis,I need to make it a roller as quick as possible,I just don't have the room or facilities to leave it apart for a long length of time.

DSmith,great looking truck.Especially happy to see it out in the field on the job and getting things done.Yes,your project is the type that I need to be looking at.

If anyone can guide me toward info and pictures of Advance Design truck on modern chassis,please let me know.