I measured a few times and measured again. The cowling went back on to check the spot on the floor and nothing had moved. The engine went back into place and the holes were drilled. The top mounts are in 4” so I will add Triax in this location for strength. I will also be adding spacers on the top mounts to get the engine level with the centerline of the cowling and fuselage. I will also be adding a support on the top.