I don't know if judges look for the small diamond on the front of the block or not. Most diamond block had no engine number stamped on them as they weren't used as car or truck engines - mostly industrial usage. That means that you or someone else would need to stamp the engine number to the approximate date the car was manufactured. This is a no no for most DMV departments (stamping a new engine number on an engine), but it happens. If you are concerned, I would take a Dremmel tool and carefully dress down the diamond mark and repaint the area.
Rusty Nelson
