I recently installed a 400 in my 65 4 spd goat. I installed cast iron headers and have an issue with clearance between the drivers side header and the rag joint. The rag joint studs are rubbing the bolt head on the front of the header. I am thinking of cutting a 1/4 inch steel plate to place under the frame half of the motor mounts. I would cut this to match the frame mount and drill to bolt directly under the mount. Will raising the engine 1/4 inch effect the drive line in any way, such as creating a vibration?