I see what you mean about buying used but that's a 50/50 proposition. You take your chances on a carb. Like the guy that used to have my 69 bought a model # correct Carter from a swap meet and was told it was ready to go. NOT.What kind of money is a 3310 750 new? I agree, even with the Eddy's hot start issues that jump to the 750 made this 383 haul A--. That's why I'm considering a new carb still to get more CFM.