I would say a lot of the Mopar shows allow 2 modifications without knocking you out of stock class, if that's what your intentions. A lot of non Mopar only shows the judges have no clue what is correct on a stock Mopar. Try and get as much original looking parts under the hood as possible. On the trans, if you have the correct shifter nobody will notice what's under the car. The judges look more at how clean and neat everything looks than date codes and such, unless you are going for concourse judging. Hope this helps. I have built and shown many original and non-stock Mopars. Good Luck