Can I use B or C body manifolds fore better flow on my sleeper GTS?

Jeremiah said

Very interesting. I never knew they existed. What year were they offered? It would be cool to find a 383 version.

As far as making one is concerned, it's not out of the question. I think it would be easier to use a b body manifold.

Reading Tom Swope's notes he mentions milling the pass manifold 5 degrees at the head flange. Wouldn't that moke the bolts/sleeve nuts crooked to the head?

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Yes the bolt holes would be crooked. The holes have to drilled at a perpendicular angle to the new face, and the holes then spot faced to square up the bolt heads.
And, the factory a-body 383, and particularly the 440 version are INSANELY expensive..... because they flow like crap and were frequently replaced with headers and thrown away.
I would figure out a way to use a b-body set if I HAD to have manifolds,.... and I was willing to throw away a hundred horsepower of a 600hp motor.....
Edit: 383 a-bodies from 67-69, 440 in 69 only, maybe 1500 darts and Cudas with 440 combined, and a bunch of those 1500 manifold sets are GONE.