There are folks who prize originality - including worn-out ignition parts & hoses - over good running condition; but if you want to actually drive & enjoy the car, a stock-spec rebuild isn't going to detract from the car's market (or enjoyment) value.
I'd hold the boring & crank work to the minimum, but all of that + the valve job will depend on the wear you find when you open the thing up & inspect it.
Worst-case scenario, keeping the external appearance stock is really the only concern as far as market value.