I think all the NA cars were catalyzed, they're more like US cars than Euro ones.
So basically, the heated seats and the cluster are the differences. Neither are a problem if the car has been properly federalized. Should have a sticker somewhere certifying that, and a clean title as well. You can swap a US e30 speedo or whole cluster to convert it, as long as you keep the 4-cyl coding chip.
I'd run a carfax, though it might not pull up much info. Price seems OK if the body is straight. Other than the Canadian paperwork, make sure of all the usual stuff...check all panels for matching VIN stickers to be sure of no major cosmetic work. Check for the usual e30 rust spots...bottom of the a-pillars, in front of the rear wheel arch, etc.