The Pontiac Tempest and it's slant 4 were never sold in Canada. Instead we got the Pontiac Beaumont which featured Chevy engines.
The 60's Buick V-6 and aluminum V-8 may have been sold in Canada, but in very small numbers, if at all. It was more common to see that V-8 in the imported Rover 3.5, who built the lightweight engine under license from Buick.