Check the dampeners...
Check the transmission mount

I'd also check the IDLE SPEED. Did you check timing chain stretch when doing the valve adjustment? Does it seem sluggish off idle? Or does it seem peppy? If the timing is off by a good bit, that always seemed to make my cars run rougher- especially when they were less than 1/4 tank.

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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E