On the 2402726 intake are all four carberator holes the same size or have mine been drilled out. Is this a Stage II. Casting date 1-5-63.

Also where are the carb numbers stamped?

The stock 1962 and 1963 M.W intakes had smaller primarys than the secondarys, the very eleusive stage 2 where modified by the factory to be the same size front and back. The carb numbers(3447S, 3447AS) are usually stamp on the right front mounting ear and or can be stamped on a tag fasten under one of the top to main body screws