It really sucks that such a beautifully finished car is giving you fits like this. Vibrations are so subjective, it would really help if you had a video of the vibration taking place, and from different angles (especially the underhood one). They can be great diagnosing tool.
My 383 always had a vibration I couldn't get rid off under a high load, low RPM situation, like 16-1800 RPM in 6th gear on the highway. Once I put the Holley Fuel injection on it, we figured out it was a miss (more like a shudder, not a hard miss) and we tuned about 90% of it out by fiddling with the timing and fuel in that area on the map.
There seems to be something about the stroker engines that enhance that type of harmonic and send it thru the whole car.
My builder putting my engine back together this time demanded that I bring him the pressure plate so he can balance the crank with the clutch assembly attached. He says if the clutch is out of balance you will definitely feel it. I'm interested to see how that turns out this go around as well.
Meanwhile, go enjoy your car... It's a beaut!!
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Lance
1985 Monte Carlo SS Street Car
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