Im trying to fin out how much my 1978 Corvette is worth

need all the info you can tell about it.

Its all numbers marching good paint has been repainted, new tires only has 89,000 original miles in great shape, has had the motor, transmission, steering, and rear end has all been home through.

http://classiccars.com/listings/find/1976/chevrolet/corvette is helpful

This is where two fools meet. One fool sells it for the price he let it go for, the other fool bought it at that price. Old saying. The price goes up and down depending on the time of year, economy, how close to graduation it is, and other factors. Look on line as suggested above. Showroom condition it top of the totem pole in price. A vehicle showing that it has been well maintained and cared for and driven, just above mid range. One that has been driven like you stoled it? Low end in price.