I use the factory 1960 transporter fuel pump and have never had any problems with volume or pressure. It is mandatory to always test the fuel pump pressure at idle on all pumps with a "T" in the line. Just because they may be new, they are NOT always correct, as there are many variables that can change the pressure. If the height of the fuel pump pushrod changes from shimming up the distributor drive pinion for stopping the unwanted up and down play (as we recommend) you will experience too high of fuel pressure. I have seen the stock pump produce 20 pounds of pressure. The normal way to address this is to shorten the pushrod so the pump diaphragm is operating in its proper operating range.
In some cases, the pump's perimeter cover screws can be loosened to relax the diaphragm and have it start from a lower location, however this should be done with the factory tools for setting this height. If the pump diaphragm is out of its range, its life will be shortened. The distributor drive pinion provides the proper stroke length so the pump still provides the correct amount of fuel but at the proper poundage without over stretching the diaphragm. I, personally, have never needed any regulator with these pumps regardless of carburetion.