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Old 07-29-2003, 03:33 PM
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Lots of budies of mine use them on circle trackers, but no one knows what they would be like on a street driver. My personal opinion, How can the 750 be too big for a 400ci? Especially with the mods you have already performed. I not sure you tuned the secondary springs correctly. I won't drive anything less than a 800 on the street. I almost always rework my 3310 to flow around 820-830 at 1.5". Never had too much drivability either. Unless the cam used pulled less than 8 inches at idle. You might need to tune the two barrels high speed air bleeds to prevent the rich condition carbs favor at high air speeds. But that would be all that you should need to do to get good fuel mileage from the two or four.
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