So, I bought this 73 duster and here is all I know about the engine in the images. It came with a Proform 750 (Pro-x images) carb on it, but it was also used on the strip exclusively. I want to be able to drive it not race it. What size carb should I be looking at? Any recommendations on model/brand? Any help would be appreciated. I am guessing the gears are upwards of 4's, but have not investigated this as of yet, but I know they are high. I will eventually bring them down to 3's w/overdrive Passon perhaps.