Through research, I found that it's a Triumph manifold with, I believe, H4S carburetors. I was able to find that the port holes are the same as my A12 (approximately 1 inch) but I couldn't find what the distance was between the holes. If it's close, this is the route I'll take.
Any Triumph experts?

Ive sent you a PM...I cannot get a pic up here but can email one.

Thanks to Dave, I won't have to hack the Datsun and MG manifolds! All the way from Australia, a perfectly fitting manifold to mount my MG SU carburetors to.

Wow that's different. Are they 1-1/4" SUs?

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Yes, 1-1/4". I will need to extend the linkages shared between the carburetors and possibly make a new heat shield.

Great to see it being used instead of sitting in my shed :)

I am in the process of having my MG painted so, the Datsun equipment hasn't received much attention. However, I should be making some engine and transmission progress soon.
I will be getting custom gauges from SpeedHut that match the original MG Smiths gauges but I was wondering what the orange and red lines should be adjusted at for the A12 motor. Any thoughts?

It depends on the camshaft you have chosen and especially the valve springs -- where does valve float begin?

* The yellow zone should start at 6000 RPM, unless you have fitted a mild cam then it should be 5600 RPM
* The red zone starts at 6400 RPM with stock Datsun valve springs. 6800 with Datsun GX valve springs, or higher with aftermarket valve springs

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Here is the stock Datsun 1200 tachometers

Datsun 1200 - 6400 redline



Datsun 1200 GX - 6800 redline

Does anyone know where I can find a transmission cover plate?