O.K, so I figured out why my 350 is a vibrator, I put a 305 crank in it not realizing at the time that they balance differently. I have an early harmonic balancer on it and a standard trans flywheel. It's not unbearable, but annoying. I hate the idea of pulling it and replacing the crank and wonder if anyone has ideas about using a fluid damper to help smooth it out. Thanks..