The only thing that is the same on these motors is the water pump and the headers. The motor with the factory pump never ran hot. The two with the CSR pump and be-cool rad did
This is a moroso set up same hoses run on our modifieds and sprint cars and never a problem. You only need 1 inch diameter same size as the stat flow. I had the factory hose on the upper and the lower is still on. It didn't make a difference. The biggest difference so far was getting the air out with the bleeder in the pump.I think I would throw that braided steel radiator hose as far as I could. Radiator hoses are 2" id for a reason. You need flow!