Ford RS200. Only 200 made,0-60 in 3.275 seconds "officially" (in 1984!) and a body by Ghia. What else do you need.

Ford RS200. Group B Supercar. 0-60 2.8 seconds. IN 1984!

For my $22000 I'd take a Hyundai Genesis Coupe 2.0 instead of a mustang.