Evo550, respectfully disagree, it's only the first 9 chapters of the MOM's that apply to everything and after that each discipline is a "standalone" set of rules - sensible and makes them easier to read and refer to, for example fuel requirements are repeated in each discipline and are not referred back to a "master chapter", so by the MOM's barkbusters are okay in both Vintage and Dirt Track.
(And would be happy to be corrected if I'm wrong, but that's my reading of the rulebook – and it's interesting to see in the introductory chapter of the MOM's that MA do not want "rulebook racing", they would prefer to have a commonsense approach – and I wholeheartedly agree)