[Green Machine]

I'll have to respectfully disagree that a 600 Edelbrock is way too big for a 307. Thats the good thing about a vac secondary carb, it can adjust for proper air flow.

Another interesting thing is check the venturi and throttle bore sizes from the edelbrock manual, the 500 and 600 are exactlythe same ! I don't know what they do to de-rate it to a 500, but there is darn little difference. We have a 650 holley on the 307 and a 600 edel on the 305 and they work just fine.

Just trying to save him a few bucks, since the 1406 is much more common they are cheaper. Most board members on here honest and will sell you a good part.