I have a rebuilt, warmed over 351C. About 300 RWHP. ANSA GTS tri-y headers, GTS mufflers, Performer and Street Avenger 670. Still have no trouble running 120-140 mph, though standard wisdom wants a larger carb for the really high speed runs. Bigger carb WILL effect mileage by 2-5 mpg and takes away a bit of the low end grunt, but with 351 c.i. and the 4:22 rear, you'll still be getting good torque. I average about 14-16 mpg on a 'normal' highway trip @ 75-85 mph. (with a heavier foot now and then) ;-)
Larry
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