Need help with vibration in 67 mustang

[micro]

Thanks for all the replys. This is not a universal or driveshaft vibration. Vibration is there with engine idling and vehicle in park. When you increase the rpm the vibration gets much worse.

Thanks MustangII460 for the years and wieghts information. The harmonic balancer is likely the early one as the wieght goes only about 1/3 of the way around. I would guess the flex plate is the original 289 one as it only has two very small wieghts both about 1 inch square and thin.

Thanks again for the good information

Micro