[rotorwrench]

Rejetting is only valuable if it needs to be changed for a reason. The best reason would be moving from say the coastal or valley regions of California to the mountain regions of Colorado. That would be a good change in altitude that would affect jetting/fuel air ratio. Too rich means poor fuel economy and the power would suffer even more. Changes in carburetion should accompany changes in bore size/stroke, compretion ratio, and cam/valve function (hopping up). Dual carbs would likely have to be rejetted small for a stocker. Less so for a thumper hot rod mill.