Over carburetion can kill power as much as under carburetion. I would think Yor safe with either the 650 or 750 as long as you spend the time to tune it right. What Rpm range is your cam made for? This will determine your manifold choice. Choose a manifold that matches your cam for best results.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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