Good evening, Stan. I would endorse the sound advice offered by Steve, above. You most definitely can sell your car via the forum, as many who have will testify - just be mindful that most on here will, like yourself, already own at least one Volvo.
Compose an honest, comprehensive advert supported by good quality photographs. A new, ideally advisory free, MOT is always a good idea, especially if yours is running out.
The 960 is a lovely, if under valued, motor car with a niche market. You could offer it on one of the 'specialist' sites, which tend to be populated by more serious knowledgeable buyers than some of those who haunt the likes of eBay.
Another alternative might be to consign it, with a sensible reverse, to auction
with someone like Matthewsons. Word of mouth among fellow enthusiasts may also bear fruit. Are you going to the 'National' this year? That would also provide an opportunity to showcase your car to a sympathetic, captive audience. Do do all that you can to prevent it falling into the hands of the banger racing community, et. al.
As Steve also said, good luck with the sale!
Regards, John.