These are BXOV-2 and have manual chokes, not sure if 2 is enough but they do have the 1-7/32 barrels.
IMHO Two is plenty. Biggest benefit of dual carbs is balancing mixture - same with port dedicated triples (like the early Corvette or Harper). But in an open plenum manifold more then two throttles is hard to manage. There is only so much CFM demanded by the underlying engine - with each throttle/venturi servicing a fraction.
