1967 383 'Commando' vs 'Super Commando'

Yes,

The 1969 A-Body 383/330 HP came through with,
* Improved Exhaust Manifolds
* Improved Exhaust Piping
* The 68' and 69' 383 Engines had a positive piston deck height
* #2843906 Cylinder Heads with 2.08" Intake and 1.74" Exhaust
* Improved Intake Manifold
* Carter AVS Carburetor (625 CFM)
* The 440 Camshaft and Valve Train

The 1969 B-Body 383 Engine (non Road Runner, Super Bee and Charger) had all of the
above, except did not have the 440 Camshaft or Valve Train.

Yet, the Horsepower ratings from the factory were both the same 330 HP, yet the
NHRA did not agree with their adjusted numbers.

If you look at the numbers, the 1967 B-Body exhaust system was a +15 HP improvement over the 1967
A-Body exhaust system.

In 1968, with exhaust system improvements - the A-Body was still -3 HP short of the B-Body 383
exhaust system output.

In 1969, the A-Body 383 was now equipped with the 440 Camshaft and Valve Train, which increased
Horsepower by +14 HP over the Stock 383 Camshaft and Valve Train.

383 Camshaft and Valve Train
.425 Intake /.437 Exhaust ~ 256/260 Duration ~ 32* Overlap
Valve Springs = #134 lbs. Valve Closed / #208 lbs. Valve Open

440 Camshaft and Valve Train
.450 Intake / .458 Exhaust ~ 268/284 Duration ~ 46* Overlap
Valve Springs = #129 lbs. Valve Closed / #280 lbs. Valve Open

Note; The NHRA lists the 440 Camshaft at .455 Intake / .470 Exhaust