408 Stroker

Cudafever said

Them are some good question, need not to be taken lightly.^^^^^^^^^^^^^^^

I will add this. normal driving, light throttle and 1500-2500 rpm. i bet the DP while perform hands down better then the SP.
If you put a converter in there that stall 35000-4500(depending on the cam you choose) SP all the way.

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Then you most likely bought the wrong SP intake. Almost all DP intakes have relatively small runners and the SP intakes are much bigger.

If you don’t account for that with cam timing and the fact that you almost DOUBLE the size carb (because all four venturi are now exposed to the plenum rather than half the carb being exposed to two venturi) you just kill power everywhere.

You can’t just thumb through the Summit website and pick a bunch of parts out and expect them to work together. You have to plan.