[Fixer]

some details,

Radius arms are in and set at 30 degrees from level as noted. This should give the car a nice low stance. 912s in '68 were set much higher [@36] so that they wouldn't handle better than the 911 !
I use a Porsche Optimoly lube for rubber to aid installing standard suspension bushings. This helps w the tight install, prevents squeaks and will keep moisture out. Modern Porsche dealerships use this in applications where one needs to slip coolant hoses over aluminum.
I use plenty of zinc enriched primer in the torque tube and inside the A arms and a little 'never seize' on my restored torsion bar splines. My original hardware is cleaned, wire wheeled and parafin waxed for a nice working look patina. Be sure to seal the A arms caps with a quality sealant.