Hi
Look man, just fly to toronto pearson airport, show them your passport and bingo, you are admitted. keep your mouth shut. do not say anything.
As for your question, they do not have any of your conviction records unless you tell them. Thats why they request for fbi clearance but only when you are immigrating NOT visiting
Cheers
1. Except when they ask the question "have you been convicted of a criminal offence" Also CBSA has access to NCIC.
PMM