Not Ranked
Dave,
The GT40X, World Products Windor Jr./Sr., Edelbrock, AFS heads are all good products. Combined with a good cam e.g. B303 or similar you can get 300-340 HP with a nice street powerband. Don't think you'll gain much by going over 600 CFM with the mods you talking about - and may lose a little on the bottom.
I agree with Dwight too - figure out what you want in power and drivability then work out the parts to make it happen.
Hope this helps,
Jim
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