Thanks for the drawings Problem is, I still have the cab on the frame, I only removed the bed, so I don't have easy access to any of the gauge holes. On top of that, it's sitting in a driveway that isn't level.
I also don't have a reference hole by the bellhousing crossmember. If I'm reading the 1st drawing correctly, it should be 2.78" from the center of the crossmember, and there's nothing there.
Looking at another thread, seems someone else had to slot the holes as well, so I think I'll bolt the front in and just slot the rear piece as needed.
https://67-72chevytrucks.com/vboard/...d.php?t=837552