Most older electric fuel pumps intended for carborated engines only produce about 4-6 pounds pressure. This is too low for the 616 and 617 engines. The original fuel pump is easy to recondition in most cases. Pretty cheap to do as well.

Electric pumps for fuel injected gas engines far too much pressure, Your car will probably run best when everything is done to run in the 17-19 pound pressure area in the base of the injection pump.