Finned vs smooth brake drum

Yeah, basically. When you register a car here as a "historic vehicle" it has to be pretty much as it left the factory, or at least could have done. So as a Dart was available only with 9" drum brakes in 1963, that's what I'm stuck with. They also told me I have to get rid of the back seat belts which I just stuck under the seat and pulled them back again later. And I had to get a special certificate (and pay some extra, of course) to get an approval for 185R13 radial tyres as the only option in 1963 was 6.50-13 tyres.
The reason for "historic" registration is you only need an inspection every 5 years, no emissions regulations and the insurance is very cheap.
Can the car get a standard registration? Seems there are no advantages to the historical one.