I ran my 340 Cuda with 3.55's 8x26" slicks, a B&M s/holeshot verter and went 13.31@101. I added a better cam/carb/intake, 4.30's, T/A 4200 verter, 10x28's and went 12.39@108.5, weight stayed the same at around 3550. Using weight/mph shows I added approx 50hp to the motor and thats not a 1 sec gain in ET.