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Micas under 1000pF usually are good and can be kept in use, but you should order replacements for the ones in the horizontal and vertical stages since those are put under a lot of stress. Leave ones in the RF and IF stages alone unless you can prove failure...they are usually fine, and changing them can mess up the alignment. They still make micas so replace mica with mica.
Caps 1000 and up are often paper, replace them with film caps the same as you should with old paper caps. They still do make paper caps but they are over priced audiophool junk... better to replace all old paper types with cheaper more reliable modern film caps.
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