Mark,
Spot on with 1021. The GT40s which race in the American historics quite often advertise their chassis numbers via their race numbers. Not always, but enough to often help spectators guess which cars they are looking at.
At the 1994 Road America GT40 reunion, while all we others slept the night before the race, Jeff Sime spent the full night working on 1021. All to the good though, as the driver for the race was one Brian Redman, who rewarded Jeff's hard work with a win.
Ronnie Spain