I have seen carbs like those go for at leat $100-200 on eBay. Just depends on wether or not you get an ebay rookie or a ski newbie bidding on them.
I have a dual 38 manifold but if I go to dual 38's... I will buy new 38 BN square bodies.
Those should pull a decent amount... they look super clean. I say ebay them! You already have the photos hosted and eBay seller fees are free if you have a starting price under 10 bucks and use a gallery this month!!