Edelbrock carbs are poor-quality imitations of the Carter AFB. Find a real OEM Carter carb and don't look back. Yes, if you use an original style 4 barrel manifold, you'll probably need an adapter plate.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!