Should be fine, if the 600 is indexed for 7 speed, or friction.
8 speed shifters however can work with 7 speed derailleur.
How to tell (from a picture) if it's indexed or friction?
It's these ones:
Open up the inside, look like indexed so far.
If you got the frame, put it on and feel how many click it got
@Tijs started
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Should be fine, if the 600 is indexed for 7 speed, or friction.
8 speed shifters however can work with 7 speed derailleur.