Make sure it's a NAS spec truck or you won't be able to buy it and bring it into the US. Oh yeah, look for rust in the bulkhead outriggers, door frames, rear cross member, bulkhead, and just about every other steel part.
CDN 013 is an NAS spec, and you could always sell it to someone in the states, but hey, If you're up in Manitoba, why settle for a 90 when you can get a nice 110? Canada has the fifteen year law, as opposed to our 25 year law, so you could even import one as new as 1990. There are some really good deals on ex Canadian Military 110s also. Keep in mind, last time I heard, Montreal still used salt, andall 90s are prone to tinworm.