Need help identifying

OK, those are not the carbs that go to that setup. Those are later AVS type, that manifold set used AFBs.
I see you are also missing the balance tube.
With that, the manifolds themselves without the carbs and tube are worth somewhere between 7 and 900.
Its a neat setup, but not particularly rare, and not desirable as current performance pieces. The runner length is tuned to work in the 3000 to 5000 rpm range.
The other downside is that they won't fit any conventional A, B or E Body car. They were only available on full size models.
On the upside, Rat Rod guys eat those things up.
BTW, the set you have there are known as Long Rams. There is a set that look very similar, but have shorter dividers in the runners, known as Short Rams. Those are valuable factory race pieces..only a dozen sets cast, and worth about five grand a set