Basically, the conversion info that you need is found in the Datsun 910 [Aussie Bluebird] workshop manual.

You need to dismantle your rear end by removing the rear axle shafts. Next, remove the wheel bearing retainer & the wheel bearing itself. This will allow you to remove the brake back plate.
The only part you keep here is the axle shaft. You may re-use the bearing, but would you want to at this stage?

Next, you simply refit the disco brake back plate, just like it says in the manual using a new bearing [preferred] & new retainer.

These brakes use a floating calliper, so they need a flexible hose from the calliper to the axle. This means that you will need to weld a mounting bracket for the hose-end to the axle housing, just like in the donor car, & shorten your brake pipes to suit.

Refit the axle shafts to the housing, fit up all the brake parts after making sure that they are all in a serviceable condition, bleed the brakes & you're away.

Well, that's basically it, ..... basically, .... but you will need to determine that the master cylinder is of a suitable bore size for these brakes, & you will probably need a brake booster to keep pedal pressures within acceptable limits, & if there is a proportioning valve in the system, then a few tests in a controlled environment to ensure that one end doesn't excessively lock up before the other would be a good idea.
Actually its a good idea to test anyway even if you don't have a proportioning valve, .. because, depending on what front brakes you have, you might need one.

See, easy peasy