John
Good to see you Saturday morning, swap meet was a bit of a bust though.
Look at the pictures on page 1 of this thread, some shows clearance to the floor from below, and some show from above with the hole cut.
http://67-72chevytrucks.com/vboard/s...d.php?t=482069
This one shows the clearance using the Camaro tail shaft.
http://67-72chevytrucks.com/vboard/s...d.php?t=313954
Let me know if you need an extra set of hands.