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If you're using the factory progressive style throttle linkage - you should - a pair of 750s will drive as if you have a single 750 double pumper. Ford used a pair of 600+ cfm carbs on stone stock 428s in the 60's - you are 50 cubes bigger.
At LEAST 600s and I would personally opt for 750s. I have a ton of these running on the street with good manners.
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Survival Motorsports
"I can do that....."
Engine Masters Challenge Entries
91 octane - single 4bbl - mufflers
2008 - 429 cid FE HR - 675HP
2007 - 429 cid FE MR - 659HP
2006 - 434 cid FE MR - 678HP
2005 - 505 cid FE MR - 752HP
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