Who rebuilds 727's?

I am looking to have a basic performance 727 rebuild for my 440 A Body and not sure who rebuilds transmissions anymore. All I am interested in is something better than what it initially had with a 4 planetary gear and other basic associated upgrades from stock.

I am in the SF Bay Area I am open to a local shop, but also wouldn't mind waiting for one to rebuilt by a well known Mopar shop. Is John Cope still building transmissions? Any other well known Mopar transmission shops?

Thank you