Just a few short years ago I remember a 3.2 with harness and DME was $5500. Then it was $6500. Then $8500. Now it's $10K. As a euro engine, as long as he has the correct DME, that should be worth $11K to $12K alone.
If the car has little to no rust, it's worth the asking price all day long. Interior is what is is, I'd find a driver seat and drive the car.
The one cost center I see is if you really wanted to use the 3.2 power, strongly and consistently, I'd consider putting a Wevo 1 piece bearing plate in it and maybe 915/73 side cover. Would go a long way to needing a trans rebuild down the road.
Correct DME with part number. No provision for O2 sensor but Sal Carceller could add it if necessary.