On 64s the engine is not on center. Started out with new thickest Cummins mounts,no go. Then went back to the mounts that have been in there for a few years,No joy. I think Dogbreath told me what I needed. Saws all and mig,and a little two inch angle tomorrow.Is the motor centered properly? It looks like where you’ve drawn the notch required that it is pretty far over towards the idler arm? Are the motor mounts and isolators all installed correctly?