well considering a few racers i know have had there cranks turned down to honda journal sizes less rotating mass. also have been hearing about it through some sportsman ihra and some of those other sanctioning bodies. the mess rotating mass is less friction which is more power. besides you cant sit there and deny the motors potentianl. but i do agree if its going into an impala you will want a 327 or bigger. 283 are great for lighter cars.