A 750 tuned right will suit the needs of 98% of all applications. Many of my friends with big inch LS-based engines run a 750. A few have tried bigger carbs - with lackluster results. One of the slower cars runs mid 10's on drag radials, through the mufflers.
I would think an Edelbrock performer RPM, Weiand Stealth, or something of the like will feed your engine plenty of air.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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