68 rs/z/28 worth

I have a 68 Camaro rs z/28 original untouched  it has 62,000 miles special order paint,numbers matching tranny motor rearend vin.... 4-speed was ordered with no console no guages and manual steering. original paint black carpet headliner pearl seats door panels car runs still has smog pump on it. I bought it  as a favor.....my attensions is to just clean it up been sitting in barn since 1979 and to sell it... guy told me he bought it in indy at dodge dealer in 1970 it had 21000 miles on it can anyone tell me its worth or how I go about finding out?

Try Hagerty Insurance web site/they track sales of cars and can tell you what fair market price would be