I would try RaceTec pistons. They are extremely easy to deal with and have a lot of stuff available that may not be in the online catalog and will make a few minor changes with no or low upcharge.
AG
They have two different brands, Auto Tech and Race Tech, I've used both with no issues, so far The owner was one of the people involved with J.E. pistons originally, he has been around a long time.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
