Lol....love it when people think what they have is a bargain, if its broke it means you have to factor in complete replacement cost by a workshop not a home job.
And when you have a damaged engine it means you are selling a complete shell only, aftermarket parts you may aswell keep and sell seperate they add no real value to it in the automotive world, a genuine R32 GTR nowdays is worth far more standard that modified as they are a collectors car in Japan.
So what you asking is $8500 for a rolling GTR shell, mayb some kid who has no idea what a GTR is really worth might see it on scumtree in a years time and think "shit its a GTR, I must buy it" but for everyone on SAU we all know you can pick one up for 10k with a few mods done, might need a small amount of TLC but thats it.
Do yourself a favour fix the engine, return it to standard, make it look nice and neat and sell it as a standard car, alot of people are buying them to store away.