As someone else mentioned, even if you got the car for nothing the cost of getting it updated and able to race would probably cost more than buying a good, used, modern mini-sprint.
The other problem you will have is getting help with car setup as it is unlikely anyone you race with will know anything about the car.....it's just not worth the time and frustration.
Check with Larry Fasse at SpeedPartz, he has some nice used cars at his shop.
www.speedpartz.com
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Phil Heil
#13e Maxim Sprint
Owner, Crew Chief, Pit Crew, Hauler, Check Writer, Grunt