I have just bought a KH Verada very well kept car interior and body. But it has a serious vibration problem that can be felt wile driving after the car has warmed up a bit it quit bad sound like something is out of balance in the engine or transmission I have been told to check engine mounts but would they cause bad vibration?
The car has about 270,000K's and also was told that once the motor gets hot it smoke out the exhaust would this be valve guide seal or rings the motor idles very smooth with no strange noises.

The vibration issue could this be the Torque Converter the person I bought it of replaced CV but problem is still there.

Is the vibration while the car is in motion or stationary at idle? Does it fluctuate with revs or is it a constant frequency?

Engine mount vibration (RH upper one, at least) tends to be worst stationary, in gear.

The Vibration is there while driving from 10K to 100K there is no noticeable vibration idling only when driving any gear. It's a very serious vibration I have worked on car for many years never come across this before sound like something really out of balance.

Does it fluctuate with revs or speed?

Is the vibration related to engine speed or road speed?

If road speed related: Check for buckled wheel(s), out of round tyres, bent suspension components, wheel alignment.