Yeah, there's virtually no stock parts on these bikes.

That's a picture of an engine Don Shumacher Racing submitted to the NHRA for approval. They wouldn't certify it. Only H-D is allowed to build one offs to be run in ProStock and thats only because H-D bought off the NHRA...ever notice it's the official bike of the NHRA? How much do you think that cost H-D?
Ever stop to wonder why the rules state that the motors and parts must be for sale and available to all and yet, George Bryce of Star Racing fame has been trying to buy and still is trying to buy a V&H/H-D motor and can't.
Did you stop to wonder why V&H was allowed the 4 valve head, a rule that was passed overnight, a head Buell subsequently wasn't allowed to use. That's another twin with the same displacement...
Have you wondered about the constantly changing minimum weights?
The rules are regularly changed to enhance V&H's entry, as soon as someone else gets close...Wait till you see PSM's next year...Only time will tell if H-D has the money for another season of V&H Racing and NHRA...