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

Teak,

Got your question..

The 1967 383 4-Barrel engine in a Barracuda or Dart GTS was factory-rated at
280 Horsepower.

But, I believe even that HP Rating was over-blown, as it was with all Mopar 383 engines.

I would make a 'guess-timate', that it was probably closer to 265 Horsepower with
the restricted AFB carburetor (525 CFM rated), and 'strangled exhaust manifolds'
and restrictive exhaust piping.

The B-Body 383 4-Barrel engine, rated at 325 Horspower was way over-blown with that rating.
I would make a guess, that the 1967 engine installed in the B-Body with the larger and less restrictive
exhaust piping was only around 280 Horsepower.