Finned vs smooth brake drum

I think so too, but will a 10" drum fit in a 13" rim? They WILL check if the tire size matches the one on papers so I wouldn't dare putting on 14" wheels.
I found that the original 1963 13" wheels don't work with the '65 and newer 10" drums. The '65 and newer 13" wheels will work with the 10" drums though. The difference in the wheels is the stamping of the center hub part of the wheel. You can tell the difference easily by the slots in the wheel. Wide slots are the early version that don't work, the narrow slots are the later ones that do work. You might be able to grind on the wheels to get clearance, but, I never tried to do that and don't know if you can gain enough to make it work or not without compromising the integrity of the wheel.