The carb numbers were probably stamped into a metal tag attached to the carbs using one of the carb screws to secure it. I'm told some guys threw away the tags during rebuilds. They "can" be used on a Buick, provided of course that the accelerator and transmission linkage can be made to attach to the throttle lever, and that they will bolt to the manifold, perhaps by using an adaptor plate. If you need the adaptor plate, be sure you have hood clearance for the extra 3/4--1 inch of height. Neither carb is a stunningly great design. If you can rebuild them cheap, fine, give 'em a whirl. If you have to pay to have 'em gone through, pass and get a new carb.
