survivor vs restoration

this is a 66 coronet if no body objects to it being on a body forum, the car is complete original running 79000 miles the only non original part is the carburetor but the original is in trunk so there will be questions the first question the tires are dry rotted coopers so I sayreplace them with generic 14 inch tires as you would expect to find on a 51 year old car can toou still buy 14 inch tires without going to coker