Carlisle Registration?

I have a 68 Dart 270. I put the engine, 4 speed, and 8 3/4 from a 72 Duster 340 into the Dart.
I also put some Cragars on it. Does this qualify as a stock (3 or less modifications), or as modified (4 or more modifications)? This will be my first trip to Chrysler Nationals. Thanks FABO.