How long should i allow for a connection at Vancouver to Air Canada?

I'm flying on NZ84 and due to arrive at 12.45 pm. I'm wanting to connect to the 2pm flight to Calgary however i think this might be too tight as the flight to Calgary will be on a seperate ticket and therefore should go for the 3pm flight and transfer to the 2pm flight if all goes well and is possible.

Any advice would be most welcome