What B2N2 said.
If the wing carry through spar is in very good condition, and the landing gear systems are undamaged, there is several thousand dollars in value in those. If the carry through par is corroded or damaged, the airplane is worth parts only. Be the time you buy and install a new carry through spar, you may as well have purchased a flying 177. Instruments and radios of that vintage have nearly no value anymore. Otherwise, I'd be doing a lot of research that you can purchase the repair parts you'll need, many 177 airframe parts are well outside the scope of make it yourself, and may not be available new at all. If they are available from Cessna, they will be very costly.
Research and budget this project very well before you undertake it. $500, take the risk, $5000, too much risk. For $500, if you choose to not go ahead with your project, you can certainly get your money back selling a few parts. For $5000, much more difficult - though still possible with a lot of your work to carefully remove them.