If you are selling a 4th gen for a price in the mid teens or better, its gotta be something desirable with the kinda mods most people cant attain. Heads and cam cars area dime a dozen so that doesnt make it all that sought after. In order for these cars to bring big bank is that it needs to perfect, nearly flawless in every aspect, then again needs to be a power adder car in most cases, turbo is the biggie, then if it has a 12 bolt or 9 inch etc, then its really looking up. Im not trying to be a dick to you guys by any means, im just saying that mods really dont add value to the bottom line short for certain ones. Also black trans am's accounted for 50%+ of over all firebird production year after year. So, my guess is 10k will be the high point you will get after a yoo detail job if you truly want it to go away fast.