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If you don’t care about original, it is possible to adapt a modern fuel pump to an early 911, as long as your fuel system has a return line to the tank. I know MFI cars do, not sure about carbed. Keep in mind that for MFI the pump needs to be happy working at 1 atm / 15 psi. Carb pumps often are rated for 10 psi or less.
The third port on the early Bosch pumps is to allow for over-pressure relief, I assume in case of fuel line blockage. The third port goes to a tee in the fuel return line. It’s possible to use a standard two port pump as long as it is rated for the correct pressure - the MFI fuel filter stand has a check valve in the return circuit that acts as a simple pressure regulator to keep pressure at 1 atm.
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