I know, but I believe it was just a HP badge. more of an embarrassment for Mopar at the time. lol
anyway the 273 was a good engine in the pre 67 a-bodies.
Not exactly, the "hp" 360s got the windage tray, a hotter cam, stiffer valve springs and a 4 barrel carburetor. And in 1978, was the fastest production vehicle, in a TRUCK no less, sounds like a performance engine to me!