help me run 12’s with a stock lookin 340

Looking to run 12's with the 340 in my 70...motor is completely stock right now cept a 670 holley, would like to keep the stock looking appearance...will be somewhat of a daily driver. Not sure what gears yet, was thinking 3.91s instead of my current 323s...tire out back 255 60 15....definately gonna do this through the manifolds..car is an auto.would like to stay away from a stroker for now, not lookin for a total rebuild
Author: BLACK71