Cortina Mk2 wheels

[Aus911]

Hi All,
I need a little advice, I have a 1968 Mk2 Cortina with the std 4 inch wheels and I need new tyres.
The tyer options for the 4 inch wheels is quite limited and I have found a set of Escort Mk1 5 inch wheels. I was hoping to fit 175/70R13 on them.
My questions are:
1. Are the 5 inch Escort Mk1 wheels compatable with the Cortina Mk2?
2. Does this tyre option sound O/K?
All advice is appreciated.
Cheers
Ray