I have a Cope Manual Reverse Valve Body (MRVB), no trans brake version in my 727. Bought it around 2010, so however they were built back then?
Haven't had any problems with it. Running 4.2:1 band lever, and the billet oversized front servo with the extra seals. No restrictor in the case. Modified front support max lug pump, and billet steel drum. Alto red clutches and Kolene steels. I think the bands are the Mopar Performance kevler, they are not the red lined ones many prefer.