Aftermarket brakes for a 70 Dart?

The K-H setup is plenty good for a street/occasional strip car.
If you want 4.5 bc, then read this thread (it's a sticky at the top of this section):
Using mustang rotors for 4.5" bc
I have started reading that thread. Would I not be better off selling what i have and getting aftermarket?
Everything I have for the KH setup looks to be new oldstock and its loaded with everything.

Just trying to compare the legwork and parts collecting to just cashing out for something else.

Also wondering how much better compared to good enough.