750 is a fine carb for a healthy 350.
personally i am not a big fan of edelbrock/carter carbs. i do believe taht there is a chart availabel on edelbrocks site taht lists the compenents to make your mix richer or leaner for idle/tip in/ and WOT tuning. if not you can always find sites that there are carter enthusiasts, they are normally glad to help.
later
tim
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