The Saginaw pumps are referred to as the .94 pump. This pump has less displacement, and only offers single stage flow control. Both styles of pumps regulate pressure with shims and a pressure relief spring. You can alter the pressures by altering the number of shims in the flow control valves. The Federal pump must be dis-assembled and the valve is on the back of the pump body itself. The Saginaw pump contains the valve in the pressure hose fitting on the back of the reservoir. In addition, a larger pulley will slow the pump, helping with the poor feel of the power units. These are the basic pumps. There are slight variations in pump models depending on the engine/chassis...input shaft location can be different and most pumps have different return line locations.
Given the features, and pressures from the chart that I posted above in my last post, it could be said that the best road feel would be had with an A or E body Federal style pump. Not only does it have the lowest output pressure, but the Federal's two-stage valve would help things as well. Adding a bigger pulley would help further. Another big boost in road feel comes from using an aftermarket 14" steering wheel (Yes, I know, I am a Die Hard Restoration Guy, but it's all about making my customers extremely satisfied, and most customers cars are Drivers). Anyway the smaller wheel raises resistance and increases feedback quite a bit. Changing shims would also provide more or less power assist to "customize" the feel.