When I got serious about doing a PS conversion on my 57 last year my first plan was to go with an electric conversion. I was looking at the units that splice into the steering shaft under the dash. I still think it's feasible but not for my car.

The show stopper is my Plymouth is a 4 speed. There was just no room under the dash for the electric motor without removing the clutch pedal (converting to an automatic).

Just my experience (luck ? ) all 5 of the original 57-58 manual steering boxes I dealt with over the years were worn to the point where they should have been sent out to be rebuilt. I got a quote from Bench Works in Phoenix last summer and that would have added another $350 (plus shipping) to the project. If I were still considering doing an electric conversion I would probably also look at converting to the manual version of the Ford Steering gear I'll be using on my 57.