super six or 4 brl?

James
Its of course your choice. However Go 2.1/4 or 2.25 pipe from your header back and you will end up with more power than a 2.5 or 2.1/2 exhaust. Although the cfm rating looks the same on 2bbl and a 4bbl they dont really equate. Thats why alot of racers run a 500cfm 2bbl on a 4 bbl manifold. Remember your fueling " an angry Bumble Bee" not a Big Block.
Frank