Finned vs smooth brake drum

Don’t know if it would fit within the regulations, but consider some ducting to bring cooling air towards the drums. There are kits for road racing that have powered fans so there is cooling even at low vehicle speed.
Maybe something that you could remove when it is time for a re inspection.

@slant six

one of the early A body guys that does auto cross events found some Porsch IIRC air ducts for brake cooling that were inexpensive and fit well on his early A, I tagged him, perhaps he will respond here