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Good afternoon; I have a 1971 H code 340 4 speed Demon, all original execept it has a 1969 stock 340 motor. My question is would it be worth looking for a 1971 340 knowing its still will not be numbers matching but correct year or leave it with the 69 motor.? Thank you.

ok guys, driving my 1971 Demon on the interstate after swapping rear ends, went from a 3:91 to a 3:23 it has a 340 4 speed anyway I had the phone with a speed odometer ap showing the actual speed and from 0 to about 20 MPH the speed were pretty even but as a picked up speed the reading became...