Doug Duell did not pass away, his father Dave did a few years ago. Doug owns and operates the dealerships. He uses Indy Cylinder Head for his engines in the Challenger and the Wagon.
With that being said, I would use Dale Meers in Buffalo, Ky or Kammer/Kammer in Dayton, Oh if you are not looking to travel too far.
If you are, there are plenty of other Mopar machine shops to choose from.

Jeff Day
Precision Automotive Machine
Canton, Ohio