Holley 650 Choke vs No Choke flow test

Picked up a Holley 650 DP carb (list#4777-1)off Craigs List the other day that still had its choke intact. After going through my scrap carb parts bin looking for a few bits and pieces, I realized I had a 650 main body with the choke horn milled off. That got the wheels turning. What kind of flow difference is there with the choke horn milled off?

Flow test conducted on a SF1020 at 1.5" hg full throttle.

With choke in place and open obviously 661 CFM
With choke horn milled off 677 CFM

I thought it would have been worth more, but now I know.