I don't know if anyone is keeping a running total. I can tell you the 1000th car was a F Ford T342 built in 1975. It was actually chassis number T342 HU190, it is now owned by Jeff Jagusch.
So it took 17 years to get to 1000 so there are a lot more in the next 32 years
. Some of the F Ford types exceeded 100 cars for each type and there must have been a lot of F3000 and CART/Champ Cars as well as Sports 2000. I'll see if anybody has kept a total but otherwise it will have to wait until I've seen all the chassis logs
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Gerald.