It looks like someone put in quite a bit of work to this car.
* Those wheels will fit if wheel spacers and possibly longer wheel studs (or just wheel adapters) are being used.
* Be aware that the airbag in the steering wheel is probably non-functional (the '86 did not have airbag as an option). It probably got there just for looks.
* 8-way power seats is rare -- especially the passenger side 8-way.
Mid $4k for high mileage 951 isn't unheard of. I agree -- theres potential. Do a PPI and proceed with caution.
Good luck!