Identify this intake

The date code looks to be around 78. Near as I can make it out. Probably a 360. Those manifolds did quite well when compared do aftermarket performance manifolds. Better than some, worse than others but good manifolds nonetheless. As for the crack??? It's probably fine if it even is a crack. I can't see how it's possible to even crack a manifold like that. Fifty bucks is good, fair in the ballpark. I've sold them for less.