AED is a Holley authorized third party supplier and makes the billet parts for the custom Holley carbs , they will build and flow test a carb for you based on your specific engine specs for less money than either of the 2 you are asking about -give them a call .
^^^This^^^^.I,ve had my AED850 built for my 410 SB for 6 yrs and will buy from them again.Bolt on,minor adjustment and go.Summit carries every AED carb size and some accessories.