I personally feel as though you should do what works for you. If it were a bolt and nut restoration and all original, and you planned on having it judged; I would say don't tint them. However with the UV rays much stronger these days, it might be a good choice for your health if nothing else. I personally will eventually tint my windows regardless of what others think. My optomitrist has written a perscription for me to have darker tint than allowed by laws in my state. I have a condition that makes my eyes much more sensitive to light than most people and besides, it will also make the car cooler. I don't have AC in my 67 but it is definitely on the list for later on. Like you mentioned, the tint can be removed if wanted/needed. So with that said, it's your car, do what suits you and your needs and don't worry about what others think. They are not the ones paying for, working on, or driving the car. It's yours, so enjoy it in your own way. I have already put a strip across the front top windshield. My car came with clear glass all around. Just my 2 cents.