Hi JP,
I would think a 1600 car fitted with a GT bonnet (hood) would have had the bonnet fitted later. Back in the seventies and eighties when Viva GTs were being scrapped a lot of people saved the 'go faster' scooped bonnets to fit to more prosaic Vivas.
In the UK and some European and other markets the Viva GT was sold from 1968 in an earlier MK I incarnation. That model had an oil temperature gauge fitted in the centre console alongside the clock. The switchgear for ignition, lights, wipers and fog lights was sited on a seperate panel beneath the main instruments like this -
As I understand things the Epic and Canadian market Viva GTs were only marketed in Canada for one year in 1970. The centre console on these cars used the same arrangement as the later MK II UK and Europe cars with the oil temperature gauge deleted and the switchgear moved from the dashboard to the centre console like the two pictures below. The middle picture is an Epic GT / Canadian Viva GT. The bottom one a UK Viva GT -
The centre consoles you have would appear to be later items from Epic / Canadian Viva GTs with the single clock and switchgear panel on the horizontal section in front of the parking brake. I doubt any of the earlier type consoles would have made their way to Canada - but I'm often wrong!
I''m certain all UK and European Viva GTs had servo assisted brakes. I've never seen one without a servo.
The Canadian Epic and Viva GTs had more basic Deluxe style interiors. I think this was something to do with the North American idea of a muscle car being a high power 'stripped out' model rather than the European idea of a GT car being a Gran Turismo higher powered luxury car. Note the lack of full door trim on the Canadian GT picture. I would think your GT would have Deluxe style trim like this rather than the SL style full door trim and seats
Continuing good luck with your restoration, JP. Keep sending us lots of pictures!