Buy it. Something to keep in mind, the 650,700 and 750( 4777,4778,4779) all have the same size throttle plates. If you decide you want a bigger carb later, swapping to a Proform or Holley main body makes yours a 750. Those main bodies also have removable air bleeds. IIRC, changing the primary metering block is a good idea if you swap to the bigger main body. I believe the emulsion tubes are different in most of the 650s.