I'd forgotten about this, but about 4 dozen people still run Model Ts on a rally across Montana every June, the Montana 500 (I posted about it in 2013)

To see the post from 2013: https://justacarguy.blogspot.com/2013/06/i-just-recently-learned-that-there-is.html

It's been an annual event since 1961 https://www.hagerty.com/media/great-reads/montana-500-model-ts-doing-the-impossible-since-1961 

The average speed of the best prepped and tuned Ts, is 54 mph