I'm conservative as far as carb size goes.
I even run a 625 road demon and my 440 tow rig winni, and find it is a great carb....

BUT 500 is way to small.

I remember I had a 600 eddy on a 400 with some mods. Threw on a 750, and saw a 30 wheel hp gain on a g tech.

I agree with running both.