check your carb settings. i had a similar problem and ended up replacing the carb. do you have a 4 or a 2 bbl? in my 4 the secondary metering rods would get stuck and run it rich almost chocking out the motor. mine did the same thing how if you would rev fast it would pop but if you did it slowly it would be ok.
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66 mustang-292-Holley 4160-World Castings Windsor Sr.-Hooker super comp headers-MSD box & Coil.3.55 gears. B&M Z-Gate-Black leather racing seats with 4pt harnes.
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