I have a 1970 GTO judge 400 cubic inch 4 speed. Having trouble with the carburetor. Thinking about a rebuild. The number on my carburetor is 7040263. In the service manual they list the carburetor as 7040273. I’m trying to verify what is the correct carburetor for this car before I rebuild the one I have or look for one that the manual suggest. There is another number on the carb which is 1075. Trying to find out what that number is also. Any help would be appreciated.