I suspect one or more of your carbs could be had with either the "speadbore" quadrajet pattern or the Holley-style "square" pattern.
You'll have to take a look to see what you have.
What's wrong with the Quadrajet? Throttle bore bushings, perhaps? I have the kit to replace them... reamers and bushings. Repairing that area often solves a LOT of problems. Also, a bad choke pulloff/secondary diaphragm or mis-set secondary air valve spring are sticking power piston will cause problems with the Quad. They really are NOT a bad carb, and don't hold a lot of fuel to boil off every time the engine is shut off "hot", like some carbs do (especially Holleys). This saves gas AND prevents a bunch of gas flooding the engine every time it's shut off hot.
The Edelbrocks are very tunable, with LOTS of experience, AND a parts kit, neither of which I have, so I can't make much of a comment about them, only the Quads, as I have LOTS of experience with them.
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