a simple cubic inch pump test will verify engine size. a racer tells them size, they pump it. if 'it's wrong /too big , he's out!!! comp eliminator does this. it's very accurate. just takes a few minutes to check. end of problem.
Thats a good idea. 400 low deck with 440 crank, you have a 0.20 440. There are some super stock cars that used this. The 200cc intake runner not as easy to check. There really does need some sort of inspections.