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I found this on a newly re-opened post on here, wondering if this is the answers we're looking for?
As for the 383's hp it goes like this:
In 67 the 383 in the Darts and Cuda's had the small exh valve (1.60) heads and the restictive exh manifolds along with a small 383 cam and the hp was 280.
In 68 the A-body 383 got the 906 heads with the larger (1.74) exh valves and the hp was raised to 300 hp.
In 1969 the A-body 383 got the larger 383 Roadrunner-SuperBee cam and the hp was raised to 330. The Roadrunner 383 was 335 because it had better flowing exh manifolds then the A-body 383.



I have a 67 Dart GTS 383 all #s matching. It was assembled 3/67. The correct date-coded heads on this one are closed chamber 915s with 1.74 exh valve., NOT 516s. I can't speak for the cam. BTW, I'm looking for an original air cleaner for '67 383 if anybody has one!