The 273 Commando motors were really cool back in the day. I remember a Hot Rod cover(think i still have it!) with a 273 commando Barracuda G/stock or something like that, that was a record holder at the time. I had one in a 65 Barracuda..and it was a great engine. But you really need a 4 speed to keep the revs up. Todays world is so different tho, actually the 340 changed everything. Now you can get cheap 360s that can make HP with any of the SB from chevy or ford.