Hyper pak exhaust manifold value

I’m wondering if the factory hyper pak exhaust manifolds ever come up for sale and what price they go for. I stopped by an old friends house and he has a set of them on a 170, I’m assuming was a factory hyper pak engine.

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Thats badass, looks good to me. Probably cracked at sometime its is over 59 years old, That's a gem for sure. A guy seen my Dart at work and told me his friends had the hyper pak intake and how crazy he thought it looked sticking out farther than the master cylinder.

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