Found my dads original 1971 duster!

To be clear, it’s not the pump that has to be tuned, it is the carburetor. I just doubt that an out of the box Carter is going to flow fuel correctly for your motor, but I will admit that tuning a carburetor is not my thing.
Ohhhhhh. Gotcha! That makes sense. I would hope that he tuned it while it was being test run on the dyno. I will verify for sure though! Thanks