Who was the great driver at this event?

[Jess Liao <jessl@domain.elided>]

I remember there was a time when an old time great driver was
invited to lead the race in a pace car, and proceeded to lap
the circuit in such amazing pace that several of the "race cars"
could not follow and managed to spun out?!

Can anyone point me where to find more info? 

Many Thanks

Jess
ps. Most importantly was he driving an Alfa?! :) probably not.

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