Cory ,306 was with the 715. 477 had a 715 , not an Autolite. "Some time" after it , the Autolite was used for drive ability or anti theft purposes , the "story" varies. The HP rating was not adjusted because these were not sold to the public , just Hertz. The substitution was not "advertised".
477 ( and 476) also had a regular Mustang hood latch as well as hood pins.
Randy