I held the engine mount up to the firewall and measured the holes and it seemed like the mount was right on the pre-punched hole location. If it is off, it is a 1/16 or less.
So I drilled the first upper left hole, and bolted on the engine mount. I used bushings to center the bolt. Then I drilled the other holes and putting in bolts as I went.
Ever hole looked like it came right on top of the pre-punched hole location.
Notice the clamp on the floor set to push up near my right hand. I used it to slightly push up on the mount until the holes were exactly aligned.
