You are bidding on a Carter Model WCD two-barrel carburetor from a 1941 Buick Model 60-70-90 with a 320 8-cylinder (front carburetor of two), tag P/N# 533S.  It is used; choke and mixture screws are free, throttle shaft is seized; it will need a rebuild.  Sold for parts or professional rebuild; this is a great item for your project or for someone who works with this model.  Shipping is FREE for USA only.