'68 Barracuda 383 4spd - throw-out bearing/other issues?

THe engine and trans must weigh over 600pounds.
If it is noticeably "lifting" during clutching, that ain't right. There is no force going in a vertical direction. All the force is fore and aft.Well maybe a small vertical vector from the Hi-mounted inboard Z-bar pivot. As said pics would help a lot!