If you're looking for a good example of a classic car, as well as searching the Honest John Classics classified ads here: classics.honestjohn.co.uk/classic-cars-for-sale/ we would suggest trying Saab owners clubs, groups and online communities. Owners who are members of these groups tend to be enthusiastic about the preservation of their cars and also benefit from the shared expertise of the group, so while it doesn't guarantee a good example it does increase your chances of finding a solid car.

Also club members will frequently sell their cars via the group, so being a member yourself is a good way to get access to these cars before the general public. You could also consider placing a wanted ad within these groups as it might catch the attention of someone who is considering selling their car.