Carburetor cfm calculator

Had a holley 770 on my 340 swinger ran great. However always felt it was lacking at low RPM driving, around the neighborhood and such...built a 600dp to see what would happen, so much "cleaner" at low RPM, off idle is great but I definitely lost my WOT performance....it falls flat much quicker now....been thinking of giving the eddy AVS2 a try on my 383 car and if I like it then put on on the 340....that's a big maybe though!