88 or 89 SuperCharged Mr2s go for a premium price, depending on condition of course. the engine bay is very cramped as well.
you saw Wheel Dealer. and yes, the alternator bearings can make some noise, if you live rainy area. and being that you're in canada, i'm guessing that they salt the roads during the winter.
with an SC setup, the alternator is on the opposite of the engine (intake vs exhaust), so that will probably NOT be a concern if you go SC.
with a canadian homed Mr2, i would expect to find some rust spots inside the wheel arches, and inspecting under the body would not hurt either.
87-89 Mr2s use the same rear suspension and have larger brakes than the 85-86. all Mr2s 85-89 use the same front suspension, but the 87-89 got a really neat air duct channel for the front brakes.
85-86 have the hand brake on the left side of the center tunnel, whereas the 87-89 have it on the right side of the center tunnel.
87-89 have a more aggressive front chin spoiler than the 85-86.
the 87-89 also USUALLY have the stronger/heavier 7-rib block denoting the upgraded internals (ie. floating versus press fit wrist pins and larger journals on both ends of the connecting rods) - the drawback of the 7-rib is that it revs up a bit slower than the earlier 3-rib versions. but, the 7-rib is stronger and can take more punishment overall.
uh... i'll post more when it comes to mind. this is all i got off the top of my head at the moment.
this is a photo of a 3-rib 4age.
this is a photo of a 7-rib 4age block.