I agree. I have 3.55s in my 375 HP 340 4 speed, and they are perfect. I had 4.56 gears in it for a while, and I did not like them. Burnouts and acceleration were great, but for all around driving, they sucked. I refused to drive on the highway for even a few miles. I don't remember the exact RPMs, but at 55 mph, the motor was screaming. Acceleration and burnouts with 3.55s are still awesome. Plus, your original post said you only planned to run it down the strip a few times.