Can a bolt be screwed in to the hole? Is it treaded?
What happened to the bracket and pump? I would think not having power steering fluid circulating through the steering gear box would cause damage.

On the engine vibrations. First thing is how old are the engine and subframe rubber mounts? If they are bad it would explain engine and front end vibrations.
Also what are the hoses attached to the valve cover (AC lines?). They are in poor condition and should be replace.

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Britton McIntyre

68 280 SE coupe 'Hairball'
70 280 SL
71 280 SEL - RIP May 2010