Holley, most definately, user tunable. parts easily accessable. easy to work on. for off road, spring loaded needle and seat, vent whistle, raise vent tube to within one fourth inch from air cleaner. have a good carb shop help with jet selection. a worn throttle shaft does not deem it junk! the carb shop can rebush it. my carb works awesome on road and off. for less than 75.00 in parts.