It's not a "new" carburetor, it has been commercially "remanufactured". All the finish and plating is gone, and it will need new internals installed, as they didn't use the correct parts, or very high quality parts for those right to start with. It may also have a "generic" calibration in it. The motor home carburetors used special primary metering rods and calibration for the big 454 engines, hopefully all those items are still in place.....Cliff