Acura Seller: Need Advice

I have a 1990 Integra LS Vtech with 168000 clean title. The body and interior need a lil work but the engine runs great. I am the second owner looking to sellout. My problem is this. I have been told by Acura aficionados that its a sought after engine and can get top dollar.
I have NO idea what to sell it for.
I have seen on craigslist a souped one, same make and model, for 2800. My body and interior are much less desirable but the engine has 100,000 less miles.

Any help in direction would greatly be appreciated.

Steve