i had put a holley carb on my car 30 plus years ago, thank gosh i kept my original quad, although the holley did good ,i was going thru the gas ,,i had an old time mechanic, do a vacuum test ,while the car running he took a propane torch unlit of course and waved it over the throttle base, rpm s, went up leading to the worn out brass throttle plate bushings had the carb rebuilt with new bushes , etc. car runs like new, roger