Vibration. Clutch or engine?

[Petegraintrain]

Been trying to find a vibration since the day I swapped my cm570 into my truck. Clutch pedal vibrates and pulsates when driving. Gets worse the more its pulling. Can feel it in the floor too but the worst when I rest my foot on the clutch just to get rid of the free play. Crazy vibration. When I swapped the engine I also replaced the clutch. So I'm thinking the clutch Is the issue. Had it at a mechanic and he thinks the vibration is coming from the engine not the clutch itself. What type of engine vibration would I be able to feel through the clutch? Anyone have any experience with that?