An '86 with the same miles is $36k
https://bringatrailer.com/listing/1986-porsche-911-carrera-targa-7/
An '86 with 107k miles is $47k
https://bringatrailer.com/listing/1986-porsche-911-carrera-targa-5/
So, $42k is right on the money.
If he wants action, tell him to raise the price to $50k.
These cars are rare as hell, and only going up in price to infinity.