[frank55a]

If you re-stamp the engine there should be a star before and after the number. Also the numbers are of a particular size. Make sure your engine rebuilder has a correct set of stamps and the star. Also to CYA take pictures of your old engine so that the number on the frame and engine show in the same picture.
If you do not re-stamp the engine take pictures of both engines so that the numbers of both engines and the frame are in the same shot.
You might check with your DMV I have found with pictures and a reasonable explanation most DMV personnel are reasonable and understanding. If you know a state trouper you might get him/her to look at the numbers and verify them.