This is a good one.
Yes, the body is bolted to the frame.
It is a two or three time lift and measure process.
Why do you ask? If your car is finished, enjoy the ride.
If you are attaching the body, you need to cover the frame rails under the cockpit with foam. Buy the roll from LoneStar ( ask for Jason or Dennis ). You will need at least four people including yourself. Lift the rear as high in the air as you can and start at the front positioning the body over the frame. It will NOT drop on. Mark your clearance points and body saw them out of the way. Use smooth cuts, they look better. Drop the body on again and see if your cuts line-up. Mark any more you need and cut again.
You should have everything stripped from the cockpit, including the parking brake.
Okay, last time. Drop the nose first, then work your way back. When you get to the cockpit, you will need to drop two or three bolts through the frame and secure it well. Leave the rear alone until you have the doors installed.
Once you have the doors installed, you can raise or lower the rear to make the door lines fit ( about an inch ). Once the doors are aligned, you can install the strikers and all that other wonderful hardware.
Hope this helps.
Do you have specific questions about the body?