Pro systems Pro series XC 4150 1000 cfm carburetor. In very nice shape. Billet base. Billet metering blocks. Light weight bowls. Was on a NA 420 ci sbf with BT 3.6 heads and a moderate size solid roller camshaft. Have build/spec sheet and original box/packaging from pro systems. Performed flawlessly. Very low run time on carb. Also have a really nice air bell/screen with a fitted, removable Outerwears cover, for a 4150 carb. Used outerwear cover on street. I have pics. Not able upload them here. $500 for carb. $550 for carb and air bell/screen. $75.00 for air bell/screen, cover and hardware. Please pm me if interested. Thanks, Mark