Based on my exeriences with racing organizations, something that isn't blatently obvious that isn't delibertly being looked for, will likely be overlooked, until that minor difference is enough to give you a competitive advantage, then you will be held to the letter of the law.
I mean realistically, you have 3-5 inspectors looking over a few hundred cars? That means they are not breaking templates, tape measures, and factory service manuals for verification. However, if you and your car begin to walk away from the competition or consistently win, then expect things to be more closely scrutinized. At that point if your wheelbase is 15% wider and 12% shorter, then you will be called out for the violation.
If your vehicle is radically altered, then you may may have to accept the fact that you can only run in non scored catagories. Maybe then you can make a case of how your resultant times prove that your modifications provide no advantage and lobby for a rule change.
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