If it's a good survivor, there is a point in not doing ANYTHING to it, as it's only original once - but reversible modifications that make it more reliable or safer, or just nice to drive, are never REALLY out of place and don't hurt the value if you put the original stuff back on to sell - and it saves the old original parts.
All about choices. I guess I "got over" wrenching on oldies in my youth. ('48 GMC, '37 Chevy, '56 Chevy, etc) I still enjoy the driving but look for the reliability and some creature comforts of a more modern ride. I'll appreciate the restorations and hotrods from a slight distance thanks. As long as I can still get behind the wheel of our MR2 I'll keep enjoying the ride!
I agree concerning the gas. Ethanol is not good for rubber parts and detonates at a high temperature causing older cars to overheat. I am fortunate in that there are gas stations close to me that sell straight gas and on occasion I will add a lead additive. Problem solved.