Bill,
Your mention of the Stromberg carburetors jogged my memory. Years ago I had a 235 with the Offenhauser three carb manifold. I built the engine from info I found in the How To Hot Rod the Chevy 6 book.
They recommended using three BXVD Stromberg single barrels...I went to the local carb shop and ordered three new ones. They looked cool and worked great. I wonder if those things are still around and how much they would be?
Stuart