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Genuine micas (not those 'micamold' paper caps) tend to still be in good working shape in tube radios, and thus don't need to be touched.
Here is a tip on rebuilding block caps. Once you remove them use a flat edge screwdriver to chip out the tar and old parts out from the underneath...The black tar at least (I hear there were other kinds) is fairly soft and easy to chip out, and it is a lot less hullabaloo than using heat to melt the tar loose.
If there are any across the power cord it likely will be obvious as IIRC Philco liked to use them as the connection lugs for the power cord.If it is a transformer powered set then tracing it should be a snap. The schematic will also probably show caps across the power cord if they are used in your set.
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