The "Sonoma Speed Festival" did an interesting thing: They split the Pre-War cars into two groups.  The "Fast" Pre-War cars ran in Group #8, and the slower, earlier, often two-man cars ran in an exhibition class called "Ragtime Cars".  The speed differential between the two groups is extreme:  It reminds me of a time decades ago when I was bombing north on Hwy 1 south of Carmel, and came upon a horse-drawn Amish buggy clopping along at walking pace.  Somehow, I got safely around.  

Today's Group #8 cars are fast, well-sorted racing machines.   I don't think Zaremba's tires on his Railton are 1935 spec

Zaremba finished 7th in the Group #8 final, McCabe finished 3rd in his ERA.   #31, Luca Maciucescu, finished 8th in his 1928 Bugatti T37A, and Chris MacAllister finished 2nd in his green ERA.