Finned vs smooth brake drum

Having just upgraded my master cylinder to dual circuit, got to thinking if finned drums would be a big improvement over the stock 9" smooth ones?
The car is 1963 Dart, cannot consider discs nor even bigger drums (probably would not fit in my 13" rims) due to strict Spanish regulations concerning cars registered as "historic" as mine is.
Lots of hills and mountain roads here in Andalucia, was thinking the finned drums would be a bit more fade resistant.