fwiw, my dad ran, back in the day on 14s, either 195/70 or 205/70 depending on what was available - usually Michelin XWX. Those were high performance tires for the bulk of the 1970s. Available these days from Coker Tires for about $300ea.
Nowadays, there are no performance 70 series tires. Comes down, quite simply, to how you plan on using the car and the appearance you want to keep.
Anything would be better than 25 year old tires though