hi you're wrong there, no polishing or any kind of rework is allowed!! only thing allowed is resized air bleeds and jetting. period. these are checked by tech. no maching of venturies, bores are measured. the thing is the fuel curve in carb. engine needs fuel. I run a T.Q., on my stocker, it has NO maching or modifications. only resized air bleeds, rejetted. the fuel curve is very flat, through the whole RPM range.