wait, jett makes an aftermarket carb? would said carb be an upgrade?

the carb on my tt.46(wich is an older os carb.....the original one got destroyed in a crash) is messed up bad and is sucking air around the needle valve. Im having trouble inding the right sleeve and needle for this carb, and the other option seems to be buying a parts motor for one. hmm might get the hot rod carb while im trying to fix it(if its better that is)