Today I adjusted the pressure on the pump. The steering feel was better, but it had no effect on the overheating issue. I am not using a p/s cooler, so I think that will be the next thing to do. I may contact Borgeson and see if they have any ideas. I checked the hoses for restrictions and found none. The flow through the new steering box seems good and unrestricted. I did some reading on the different displacements of Saginaw P style power steering pumps and can not find anything drastically different with the pump I am using.
Funny how these little things can side track a project...