help buying a bug??

It’s a 58 model it has 2 sets of flared steel guards as well as standard ones spare pan couple of sets of trim the body looks as if it is in good condition it is suppose to be a pobjoy engine the owner said it is a 1300 with 1600 internals it has a holly carb lowered suspension and a ton load of other bits it is in need of a resto not a complete one will make a great rat looker it hasn't been registered for about 20 years and in the same family since new
First where do they rust?
secondly what is it worth?
wacked1

check the A pillars at floor level the floor pans under the battery mostly and the c pillars outside on either side of the rear window for rust

Everyone says "It's a pobjoy". Don't believe them. Get the engine number, ring up Stan and ask him. I think he has kept a record of every one he's done. I think newer ones have a plaque that has his name on it too (not sure).