According to the 2014 NHRA RULE BOOK - All cars in Stock classes must be factory-production assembled , showroom available, and in the hands of the general public. A minimum of 500 units of a particular style must be produced.
How many of the factory cars (copo's drag-packs, cobra jets) are built each year??? How many of them are available to the general public through the dealer showrooms??
I think many of the questions can be answered by examining these criteria.
Evidently NHRA doesn't follow their own rulebook.
Don't get me wrong, I love the new cars (built after 2008), they just need to be put where they belong and factored properly.