68 camaro question

i own a 1968, true ss 396, matching numbers, all original camaro with just under 50,000 miles on it. it has a 12 bolt 3:08 rear end and a turbo 400 tranny and a vinyl top. it has been sitting for 15 years in santa cruz california under a tarp. it has rust but not very bad and the paint looks good. the interior is in almost perfect condition with some rat damage but i vacuumed it out and cleaned it nicely and it looks pretty good now, almost not even noticable. it runs great, but does have some lifter noise. i was wondering without any pictures, and based on that information, what might this car be worth.

thanks

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