When Kraumaster owned my Newport, he converted to front disc brakes using the booster and master cylinder from a Formal. He even gave me a spare booster and master with the car. Dunno how he did it but it works and works well.
Dont use LED's for the front turn, those lenses have a bullseye lens in them set up for the filament portion of the bulb to shine through it. An LED won't focus the light where it needs to in those lenses.