Greetings . . .
Those can be had new from Price's
Vintage Speed for a hundred buck - so this auction is still a deal.
It's a copy of the one's you could get from Almquist back in the day. Not sure how the engine can take advantage of the second carb through the a single a hole in the plenum - same CFM but split through multiple venturi.
Price also makes an adapter that would let you mount 2 or 3 Stromberg's on a square bore four barrel manifold.
regards,
stock49