Identification numbers on front of 273 block

Can I assume that when it is said in this thread that the engine was Canadian built, what is actually meant is built for Canadian sale? For instance in 1970 there were 191,000 Darts Built and only 3000 some of them were built in the US. The rest were built in Windsor, presumably with Windsor built engines? But I think that those destined for sale in the US used the more conventional block front stamping, while those slated for sale in Canada used the other stamping style?
I believe I just said the car was Canadian built, I also believe the engine would have been manufactured in the US not in Canada but the stamp is definitely Canadian installed engine.