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Another insight into the 67 A-Body 383 manifold is that the steering column in a 67 has a longer bearing sleeve plus a spring that goes quite aways down the rod towards the sector, to the exhaust manifold had to have a deeper cast. They redesigned the entire column for 68. I am still of the opinion that the 67 GTS 383 had a smaller cam. I cannot find any documentation of that in any of my books though. Don't forget the wheelwell in the Dart could only hold a small tire compared to the Barracuda, even though the came with the same size tire from the factory.

Yes the 67 383 did have a smaller cam like.390 or .400 lift, i saw in print in a factory brochure.