My buddy Pete called Saturday afternoon asking me what a '75 coupe might be worth. A lady showed up at his club's car show Saturday morning looking to sell her Corvette. She had purchased it new and drove it for about 20 years before parking it in a shed - where it has remained ever since. She was asking $1,500 for it. Well Pete's curiosity was peaked so he drove out to look at it on Sunday.
What he found was a Bright Blue L-48 automatic with a silver interior - but this one might be a little bit more of a project than you want to tackle. The door of the shed had been gone for some time leaving the rear of the car exposed to the elements so the rear bumper cover is shot. All four tires are flat and the car has settled into the dirt floor some. Both doors opened easily and Pete said that surprisingly there didn't appear to be any rodent damage to the interior. They tried to open the hood but only one latch would release so he couldn't get a look at the engine compartment.
From the way he described it my guess is the frame would be questionable at best, the brakes are probably solid chunks of rust and most of the suspension would probably need to be replaced. And it definitely needed paint. The only good points about the car that I could see are that it is a one owner car with a tad over 90k miles.
Why someone would be so unkind like that to any vehicle, let alone a Corvette, is beyond me.
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Jim Olson
"The Toys"...!!! Save the Wave! 
Where I've been in a Corvette...!!!
I "MAY" be able to fix you up with a REAL nice all done frame and running gear.