Clearance between header and ground ???? 1971 A Body
Nice shop!
Now, having just had 5 layer back surgery all can say is:
Get some help getting everything you need inside moved, get a chair and a few more of your coffee/honey and whiskey mixtures and relax. Get some graph paper and plan your lighting and layout. You will be on light-duty for a while!
Good luck!
Oh yeah, nice shop!