super six advise and questions

my dart has a mostly stock rebuilt /6 from a 68 fish. i have a cast super 6 intake. i dont have any of the other oe parts to the super 6 but do have a couple 2 bbl carbs laying around. how much carb is to much? is it better to just find a bbd?
I have a holley 2 bbl from a 360.
a holley 500 2 bbl
a Demon 500 2 bbl