The First 1967 383 A-Body, 'Barracuda or Mr. Norms's Dart'

Also had a smaller cam profile and 1.60" exhaust valves. Cam profile changed in 68 as well as a bigger exhaust valve

The HP went up in each of the three years. At some point, maybe 68 model year and I'm pretty sure 69, they started using the Road Runner/Super Bee engine with the better heads, cam, etc. But the exhaust was still choked down with the restrictive exhaust manifold. The 68 RR 383 had a higher rating than prior 383-4bbl engines because of the changes.