They are an interesting old gun, I have not seen one in use for a while.
http://www.remington.com/library/histor ... rtsman.asp
The 58 has not been made for 43 years. Some parts may not be easy to get but they can be obtained so any breakage would be an inconveniance, not a major problem.
The 58's did have a reputation for develping a crack in the receiver behind the bolt handle slot.
58's predate Remchokes chokes so the guns will either have fixed chokes or a device like a Polychoke or Cutts Compesator which allow choke changes; that is unless they have been fitted more recently with custom choke tubes.
If the fixed choke suits most of you sporting clays use, it may work for you.
The gas system is inside the mag tube, rather than on the outside of the tube (like that of an 1100), making cleaning more involved.
Though it would not be my choice for my use, if the above mentioned things are taken into consideration, the 58 may work well for what you want to do with it, depending how much shooting you plan to do.