...Interestingly, Chart 6 on Page 1332 show what ET is possible with the proper chassis and transmission setup. A stock 340 with a race weight of 3250 should turn 12.70's in the quarter mile. Stock with tires, torque converter and good driving. Not bad.
I wish I could find my old DC book. I remember the chart that told you what to do to go 14.0, 13.5, 13.0, etc....suspension, tires, weight, engine mods.