i remember hearing of a Mopar especially prepared 1970 Hemi Cuda 4 speed car with 4.10 gears in the Dana 60 that Mopar marketing had hidden in L.A. waiting for a phone call from Petersen publishing wanting to test a new hem powered E body for one of their magazines in the fall of 1969. That car was a ringer and Mopar didn't want the magazine to know that car was special
That was brought up at one of the drag racing seminars in either 1976 or 1978 at one of the seminars in CA back then by Larry Shepard or Tom Hoover