I know several people talked about leveling the drive train. With the engine oil sump in the rear, I didn't think it needed to be completely level. While installing the headers I realized the oil pan (at the rear of the engine) was below the frame rails. I added a 3/4" trans shim, which brought the oil pan up above the frame rails. Time to revisit the pinion angle. The first pic is at a little too much of an camera angle to have a good view of how much the oil pan is down below the frame.
Oil Pan Height BEFORE adding .750 Trans Shim.jpg Oil Pan Height after adding .750 Trans Shim.jpg
EDITED 9/28/20
Decided to cut the bottom of the bell housing to increase the ground clearance.