I recently swapped a Clark 5 spd in for my sm465 (behind a 454 TBI). The new flywheel and 13" clutch assembly are considerably larger. There is now some shudder (vibration) with the new assembly. I noticed that the old flywheel had some material drilled out to balance the rotating assembly. Does this mean I will need to pull the engine and have it and the flywheel balanced together? or...Any suggestions?