Value of a complete '69 GMC Factory Air System?

[Orange '71 GMC]

I am talking about EVERYTHING - less the duct work. The only other POSSIBLE minus would be the wiring harness, but that will most likely be coming out too.

I am just wondering how much one of these systems is worth. It is used, and some pieces probably could stand replacing, but it is currently in my truck, and is in complete working condition.

Not asking for offers here...I am just trying to see how much I should expect out of it. I am probably going to try to sell it locally first. Then if that doesn't go through, I have other plans for selling.

Thanks in advance everyone!