As to which cam the 69 383 A body had, for what its worth, my 1969 shop manual shows two cams for the 383 engine: the standard 256/260 cam and for the "Barracuda" and "Road Runner" the hi-po 268/284 cam.

My 67 shop manual shows only the 256/260 cam for 383's and I don't have a 68 shop manual.