Mopar Mistake 'Not offering a 273 Commando HP II 'option'

I think the real problem with duals on 66/67 cars is the single strap and offset gas tank. The 68 & up have 2 straps front to rear and centered tank so both frame rails are open for the exhaust tubes on the rear.

Had to cut the j hook on my car to give room for the exhaust pipe.

Seems most of the time the companies were under rating HP but maybe in the case of the 273 it was overrated.