I have a 1987 z28 that previously had a 383 motor with a Corvette 6 spd trany.
I replaced the worn out 383 motor with a Target remanufacture 350/350 HP.
I also replaced the Clutch pressure plate and fly wheel, pilot bushing.
Now there is a pretty good vibration in the car. The whole dash vibrates at an idle and get worse as you accelerate.
Any clue ? Thanks

 

Does the engine run smooth besides the vibration? I only ask because I had a similar vibration and it ended up being a faulty timing set that advanced the timing too much.