A bunch of Pantera engine folks who have written on the subject of carburetors over the last 40 years have strongly advised against mechanical secondary carbs for a street Pantera. I am humbly in agreement with those who have gone before.
The "Street Demon" carb recommended in sticky #3 is equipped with annular booster venturis and has a vacuum secondary. I like Quick Fuel carburetors but none of the Quick Fuel vacuum secondary carbs are equipped with annular boosters.
The annular boosters shall better atomize fuel for better fuel distribution within the intake manifold, and provide a stronger "signal" at low rpm. At low rpm annular boosters provide the same benefit as a spread bore carburetor. But annular boosters provide benefit at all rpm.
Mahalo Brah
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