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You have a lot of decisions to make about them. But, do yourself a favor and go to the engine rebuilding forum and read, read, read and then decide what to do depending on what cylinders you have. A couple of notes, if you buy a set of used Nikasil cylinders do not hone them! Prep them with red scothbrite. If they are in spec and in good shape you will see the cross hatching no problem. Just use the scotchbrite to clean them up. The rings will seat fine. On my 2.7 being a noob at this I thought if they were marked Mahle they were Nikasil. That could not be farther from the truth. I bought boxes of used Mahle alusil cylinders before someone on the forum that actually knew what they were sent me a set (Nikasil that is). If you buy used there are a couple of guys on the forum that might have a set and I would trust them if they say they are in spec. Otherwise look out. If you have Alusil cylinders they can be chromed and reused. In fact some of the chrome shops will buy them from you if you don't use them. But do a lot of research on them before you start making expensive mistakes.
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76 911S Targa
An ex F1 driver, and Porsche fanatic (my stepfather) once told me that if you listen very carefully on a quiet night you can actually HEAR Porsches rusting in the garage!
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