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Well, in my hast with my manifold I didn't notice that the gasket for a QJ was still on the manifold and it turns out it was over a spread bore plenum like the one in the bottom picture of the two blue manifolds. So, I guess I have a 79 360 manifold for a QJ or thermo quad. Thanks to all that...

I have an intake manifold casting #4100340-3. I believe it to be a 1978 360 truck manifold with a quadra jet plenum. It had an aluminum adapter with a Holley 750 df/dp. I bought it this way and am in the process of doing the seats and guides on the heads. When I took off the carb I was surprised...