Hey guys I have a buddy who has a 68 charger with a 727 automatic. He swapped the 383 for a 440 and since the new engine was installed it has a constant vibration that seems to be coming from the engine or transmission. It happens all the time even in park so we know its not the driveshaft or rearend.

Any ideas on where to start looking to cure the problem?
Thank you
Stu