Another 273 commando build .. This one will be a "BEAST"

First time I ever herd of a "273" was in the 80's I was a teenager and a guy probably twice my age had a 66 barracuda, like kids at the time do i walked over asked him about it he's like "its a 273" I remember thinking "what's a 273? never heard of it..."it actually sounded small when all ya ever heard was 350, 351 Cleveland, 396,454, 383,440 etc.:)