Looks like a nice, original GT convertible. Enjoy it as I am mine. If you elect to do some modifications or changes, save all the old parts. Put em in boxes and label them for the future owner. Nothing I am doing to mine can't be undone and the future owner will have the option to go back to stock if they wish.
The reality is we are all only temporary stewards of these cars for a short period of time and eventually they will hopefully be passed onto someone else that has the passion for preserving these cars that we all do.
I respect those that want to keep them original, but also those that want to make changes to make them their own. To me that's the fun part about these cars. We all only get one lap in life, so we should do what makes us happy and not worry about what others think or what their opinions are. It's your car, do what makes you happy and have fun. I would have to do gears, exhaust and a shifter at minimum, but that's just me because those items really make these cars fun to drive.
If you decide to keep a well maintained stock GT, great, if otherwise, that's good also. The hood blanket in my 87GT was heavily stained and falling apart when I got the car so mine went.
Good luck with it.