What classic car? (hypothetical))

I second the X1/9. Very suited to autocross and will be cheap on consumables.

I have to say though, that blue GTV6 - Rowwrrrr!

David S. Wallens wrote: How about a rubber-bumper MGB?

I would rather have a Triumph then an MG (exception MG T-series or A but neither of those is near $4k).

Someone mentioned the Volvo 1800...but no Amazon love?

You can buy running, driving examples for very low 4 figure money, and it's the same drivetrain and suspension as the 1800.

Bought this a few months ago for under 1000, and put about 400 in parts into it to make it a daily driver:

For less than 1000 more it's an IPD springs and sways setup and some sticky meats away from being an autocross gem.