Re: Hump Related
Your transmission and driveshaft are underneath there. You should have at least 4-6" of clearance, so if you use 1" screws, you'll be fine.
To give you an idea, I'm about to install a B&M shifter into my 1989 CV and the shifter bolts through the hump using 1.5" bolts with nuts on the back.
In other words, you should have plenty of clearance. Just to be sure, though, climb under there and take a quick look, to be sure you won't catch any wiring harnesses or anything during the drilling.