Mercedes-Benz R129 SL300 Convertible Classic

I am selling my classic Mercedes-Benz R129 SL300 Convertible Classic, two front wings have been replaced, painted, spent a lot, the car is almost done, only the revs RPM need to be done, I can't find a mechanic, who for a reasonable price he can do the car, If you have one, please advise. If you have someone who can do the RPM revs, please advise or you can buy a car. Such cars cost from 12 000 to 20,000, and more... Don't offer low prices I won't accept low prices I want my money back if you can offer something close to the asking price I will consider. Thanks