So, accepting that any likely purchase will have had some attention at some time, it is important to ensure that repairs have been carried out competently, to the original specification, and that adequate anti-corrosion treatment has been applied. I have seen several cars recently where the lower part of the front wing has been joined to the sill panel and the gap has been sealed with filler. Apart from looking totally wrong, water finding its way behind the baffle plate cannot escape. Remember, too, that chrome parts are getting rarer and re-chroming is expensive. Mechanically things look much better.
Most mechanical items are available and relatively inexpensive.
Even a rebuilt engine with unleaded conversion costs only about 600 and this is probably the most expensive item you will ever need. Gearboxes last a long time, with their only real weakness being second gear and synchromesh. Suspension and steering components are robust and simple, with rubber bushes, etc. One weak point is the front suspension rear-facing tiebars which can wear thin by the floor brackets. Looking at the interior, obviously the most important area is the leather seats.