Of course my advice is obvious, but just for the say so, check on the backside of the lid to see if you can see any bondo in the filled in holes. If there, carefully drill them out with a real small bit from the inside, then carefully drill them to size from the outside.
-Parting Out over 75 '58 to '73 Full Size Chevy Cars-
-National Impala Association
-Vintage Chevrolet Club of America