bringing motor from the sates into canada

[67 GTO]

I wouldn't sweat it. It's "Antique Auto Parts". If they need to know, it's a rebuildable core. There shouldn't be any duty on it, but expect to have to pay tax based on what you paid. They may try to get you with "what's it worth?" if they feel it's undervalued, so make certain you've got a proper receipt from the seller. I've brought several motors across without hassle, just depends on who you get at the crossing...