What is a cast iron 2bbl intake worth

Personally, I wouldn't pay anywhere near $250 for a stock 2bbl manfold. Might consider that much, for a "COMPLETE" set up, with a good exhaust manifold, carb, air cleaner, kickdown linkage. The kickdown linkage is the hardest thing to find, but a cable kickdown can be used.

PS: I have a couple of aluminum 2 bbl manifolds (OEM two piece welded), but that's all I have. I'll sell all I have for $250 ea, and ship for free.
I never paid that price either and have had a few. But, they will bring that $ if someone wants one,can't find it anywhere and there it is listed on FB or FeeBay!
I had last year, a Tx 79 Volare wagon , rust free, complete non runner with a super six I could not get $500 for the whole car!!! Ha