I checked motor mounts but I will recheck them again. We cranked down the suspension at the track with straps really low so it was almost rigid so I will check the frame for any cracks as well. I used an oem flywheel key. When it was shearing them after the rebuild I ordered like 4 of them. I had an oddball retaining nut on and now I have the oem nut with red loctite, I forgot loctite when I installed the flywheel last time.

Red Loctite is not necessary if you have the crank and flywheel lapped to fit each other and torque the flywheel nut to spec.  If you are still shearing flywheel keys your tapers are still not fitting each other properly.