There will be a few don't worry! For sure you will have to drill the body mounts. See my post. I covered what I had to do to my 3A body kit. Just make sure you start with the front end. Put on the grill and the fenders and fasten them loosely. Then put on the tub and line it up as best you can. You will see there is a body ""hat channel" that will pretty much line up with the frame holes when all is well.

On mine I had to have the firewall modified by the body shop. It hit the motor in the back at the throttle linkage bracket before the tub would come all the way forward.