[Dominik]

The OPEL Corsa-C, built from 2002 to ? has an electrical power steering. The beauty of this unit is, the steering rack intermediate shaft has a "Double-D" (lol) universal (which is a flattened 3/4" / 19 mm shaft, milled double-flat to 9/16" / 14 mm. This should be easily adaptable to any steering rack.

You may want to check your castor and (what's it called, roll radius?) to ease on your steering efforts. Essentially your backspacing of the front wheels could create too much leverage on the steering. I also found that old tires turn very badly.

And for those who use i.e. a MGB steering rack, it comes in two different ratios. Not sure what mine had, but with a 16" steering wheel I could steer the car with one hand while pushing it around in the yard - until I created to much friction based on the Ackermann settings.

Hold back your horses when somebody asks. I inquired once for an automatic for a GT40 and got useless comments. It was for a one-armed owner (which I cold have mentioned, I know).