Its not worht it. The guy knows what he has, and how popular it is. He's hoping to find some F&F fanboy to sell it to. hopefully you arent like that. I got my 89 with 140xxx miles for 2 grand, in immaculate condition... almost. Show him the KBB value for private party resale.
Point out all the flaws and offer him at most 2000 for it. If he doesnt take it, then walk away.
http://www.kbb.com/KBB/UsedCars/PricingReport.aspx?ManufacturerId=35&YearId=1991&V ehicleClass=UsedCar&VehicleId=OC8xNy8yMDA3fDExMTkw &PriceType=Private+Party&ModelId=464&Mileage=20600 0&SelectionHistory=11190%7c3945%7c90210%7c0%7c0%7c 397099%7ctrue%7c397139%7ctrue&Condition=Fair&QuizC onditions=0 this is for fair value. its worth 1500. I used 90210 because i didnt know of any other california zip codes. But yeah thats about it.