Gentlemen,
you realize our competition: Chevrolet, offered 2x4 bbl and stock rear dump exhaust manifolds on a 302 ci with a smog pump! Was this a fluke?
I'm confident Mother Mopar wasn't far behind. The six pack was rated at 1000 cfm. Ma mopar used manifolds on the TA. Seems logical that one could exceed the 340 cam's potential with manifolds...