Originally posted by BKR
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The Raising of carb size without other engine modifications generally does nothing but hurt low end performance(towing and off the line 0-60 mph). Over carbing is one of the most common things even people who " know what they're doing" do because its easy to do(four bolts and a gas line) and sounds cool to say," yeah I got a holley 750cfm double pumper on it.", and looks cool.
If you wanna tow leave it alone.
If you wanna go fast.... Put in a cam and nitrous in.
The engineers at Ford weren't stupid, they built those right for normal use.
https://www.holley.com/retailer/carbselector/
Always go smaller if you're in between.
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