The steering post bracket unbolts
Here's one that's modified

I reckon there's enough room to mount it on the side of the bracket, if you make the pedal loop around and down
1. master cylinder mount bracket added to the top of the 1200's steering colum support
2. weld an extension to the top of the brake pedal
3. make a rod to connect the master cylinder from the brake pedal
Use remote filler caps like these Datsun F10 caps which fit most Datsun master cylinders

