keep or sell original single barrel intake

I save everything, so i might not be the best one to answer that. If you have room, no harm in stashing it and the carburetor and associated 1bbl stuff away. Not that you would use it again if your running the 2bbl and like it. I am assuming its cast iron and the super six setup was aluminum. If so you lightened the front end a bit too. Or sell it. Theres always somebody looking for stock stuff.