Well I can't say anything on a 73, but I purchased a carpet kit for my 78 from Corvette Central. If you take your time removing your old carpet, so you know how to put it back it easy. The rear is the hardest to do. It took more time to get everything out of the way than it did to actually does to do the carpet. You know the seats, trim and stuff like that.
Just a note to check the floor before reinstalling. If there is any rust, treat it now. Even a hint of it. Also make sure the heat shield/sound tampener is good. Once you've got it all apart that's the time to fix anything that may need help. Oh Yes, be careful removing the storage door frame; When they are old they like to crack and break if flexed to much.
GOOD LUCK