Welcome to the site, Sam!
Here's your first history lesson...E-bodies are built with a uni-body structure, meaning there are no sub-frames or removable sections of the frame (unless you consider the K-frame).
So technically, you'll be doing a 'frame-attached' restoration.
Technicalities aside, it sounds like you have a very nice start and should be a cool car once you're finished with it.
Have you decided on a master plan of how you want the car to turn out? (Paint, interior color, engine choice, etc.) Welcome to the site and enjoy your stay.
BTW: You purchased your '73 'Cuda at the same age I purchased my '73 Challenger. Hopefully you can complete it all before you begin college. Mine's been sitting ever since I finished high school, but I'm hoping to have it completed, or at least running & ~90% complete, by the time I'm 25 (23 now). Good luck with the build.