Richard, I'm not sure that you're asking too much. If you're selling to a 20+ as a daily and something to lay rubber in on a Fri/Sat night well yeah it's too much but by the sounds of things it's more a Commodre enthusiast's car.
If it's as clean and straight as you say, and it looks, the right person will want it for the right reasons. Original cars, especially bloody Comodores, are hard to come by .. I guess it comes down to how fast you want to sell it.