Holley via eBay offers its factory-refurbished Holley 600CFM 4-Barrel Aluminum Street Performance Carburetor, model no. 0-80457SA, for $199.99 with free shipping. That's $114 under the lowest total price we could find for a new unit. It features an electric choke, single-feed fuel inlet, timed (spark) port, full vacuum, and PCV port.