The 350 and 400 flex plates are the same. The harmonic dampers are different. I'm putting a 383 (400 crank in 350 block) together to replace a 350 in my 98 Silverado. Because I'm building a core engine and don't have the engine out of the truck yet, I had to buy a new flex plate for the machine shop to do the custom balance on the rotating assy. It was quite a bit cheaper to go with a 400 damper than have a huge amount of weight added to the crank. Weighting the crank might be better for high rpm's, but this will be a trailer towing/daily driving engine. Like Gary says, we need to know if the vibration present only when driving, or can it be recreated in neutral with engine speed?
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