Spent my innocent youth on the factory proving grounds of Woodward Blvd. Telegraph=West side turf and Gratiot Ave.=East side turf (my turf).
Heads up just like HOTRODPAINT described.
If you were quick, your rep preceded you. Not by name but by the description of your ride.
You didn't give up lengths, but you may concede to "going on the roll" (if you felt sorry for your opponent).
You didn't give up your mods, and there was no peeking under the hood.
Yes there were Racing for Pinks for those with the Bravado and confidence. Often a East vs West thing.

How many remember Rosin burnouts?
If you were to do that today Homeland Security would FREAK!