1941 Buick Special
Pretty much all original continuously operated for 80 years.... 12v alternator, Pertronix and twin Weber 32/36DGV's are the extent of the modifications done.
Paint and exterior
Unique at any cruise in. Scares a lot of folks though.....
Upholstery and interior
Great driver with coils all around, sway bars from the factory and unequal A-arm front suspension. Brakes also more than adequate for modern traffic. Professional Careologist think it has pretty much just had routine maintenance done.
About 500 miles a year as a best guess.