Just a hint, spray around the base of the carb, intake, hoses, etc with starter fluid or carb spray. If you here the idle pick up, you found your vaccum leak. If you're a smoker, you could also exhale and keep an eye on the smoke.
Aside from the typical holley, you could also get one of the Edelbrock carbs. I bought a 750 Edelbrock VS with electric choke and love it. Very easy to tune and set up, and was about on par cost wise with a Holley 600cfm that came on a 350 that was in my wagon when I bought it. That thing was and still is the biggest piece of crap I've EVER used. The choke was horrible, idle was ridiculously high, and the tolerances were so bad that the throttle arm would never return completely unless you forcibly pushed against it.
Can't find em much cheaper than through Summit.
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