edelbrock to holley conversion

Goody, now I'm really confused. I thought a spread bore has larger secondaries than the primaries. The square bore has all equal size bores and butterflies. My Holley I just picked up has dual feed and all the butterflies and bores are the same size:read2: I know the Holley carbs can be finicky to setup but, I'm up to the challenge, I've got a couple of friends that can bail me out if I really screw it up:)