1987-1992 or so Mustang LX 5.0 or GT.
A mildly modded car with no engine stuff should be able to kick the snot out of a Type R in the straights, but for braking and road race courses, they sit a little behind.
My suggestion is to check out
www.classifieds2000.com
Look around in your area or the state for that matter. Tons of stangs down there and see what you can find.
Good Luck!