Pro Stock Truck. Man I loved that class

My Neighbor has a 2000 Super Stock Dakota. He built it from brand new never on the road.
NHRA said he can't run it in stock or super stock and for some reason it can't be used for GT class.
It's pro built and supposed to be legal. He got tired fighting NHRA and parked it 17 years ago.
I have no idea what the problem is. No he won't sell.