Starting in '70 the Barracuda could have a /6, 318, 383-2bbl or 383-4bbl. They had 10" brakes and IIRC an 8.25" rear end. If you wanted a little nicer interior (even leather) and the 11" brakes, and an 8.75" rear end you had to step up to the 'cuda. A 'cuda could have a "Road Runner" 383-4bbl, a 340-4bbl, a 440-6bbl, or a 426 Hemi. All 'cudas has hoods with "scoops" (either functional or not) but not available on a Barracuda.