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

Jeremiah said

What was the price of that exhaust manifold? Was it sold in a set? Was the application specifically big block a body? How long ago did the make them?

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They made very few, one size for a 383 and one for a 440. I have a 440 one and saw a 383 one for sale at Carlisle a couple years ago, but I have no idea how many were made. You can make one yourself if you know how to weld steel pipe onto cast iron...