Easily $70k + if "pretty much perfect". Auto Kennel has a real nice ROW car at $105k ask. Doubt they will take anything under $90k.
https://www.ebay.com/itm/1989-Porsche-911-G50-ROW-Euro-Carrera-No-Sunroof/283018809458?hash=item41e53c5072:g
PgAAOSwf5BbK~U H&vxp=mtr