A 750 Vac. sec. will work well on a 400, especially if you have a mild cam. My 406 has ported no.48's, a Crane 284H (284 dur., 228 dur @ .050, .480 lift), 750 vac. sec. on an e-performer, Hooker comps and 2 1/2" duals, TH-350 w/ 2200 conv., 3.08 posi and my 'Bird runs consistent 13.0x's.
The DP's are good for competition but will kill you on the mpg- the vac.sec. is much better suited for the street, as your engine will tell the carb when it wants more fuel and open the secondaries.
Geno
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