replies here will be just about the same.
here's one from the hamb....
From 1965 1/2 catalogue:
Model WCV 283 - Fits 283 and 327 cubic inch engines.
This manifold with its large plenum chamber design is made for all out Drag-Strip performance. Made for AFB Carter carbs. No heat. Also an excellent unit for high performance Marine conversions. Like our other manifolds, this one is cast of high grade aircraft aluminum alloy.
For show use, you may order this manifold polished to a high finish for a modest extra charge.
Part number 7250 - $92.50