[chuckbrandt]

It definitely looks like a CJ manifold but weren't CJs cast iron?

I think it's an aluminum CJ manifold which seems pretty unusual to me. I don't know a lot about 428 stuff though.

I don't think it's non-sidewinder medium riser manifold because it has four holes not 2 oval.

My vote is it's a '68 CJ/PI/SCJ cast in aluminum instead of iron. Probably a pretty decent manifold if it's like a PI.

Chuck