"Heeeere's Number One! (one, one one....)")
I've found a site for you which lists the weekly top 50 of CHUM radio in Toronto. The lists are complete from 1957 to 1986, here. A tip of the hat to the guys who did all the transcribing and formatting work.
The lists are billed as the "Canadian" top 50 (*sigh*), but the lists seem naturally biased towards Ontario artists. You also get quirky hits, as obscure artists get playlist rotation and the listeners really like the song. For example, Big Ed Wheeler is at number four on the first chart on this list.
A very useful resource.