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All elements that are properly designed have duty factors and safety factors, and you do not want to be encroaching on them. These are to account for peak loadings or ones that can be very transient, and for material variability.
The only safe way to establish the capacity of the gearbox is to see what engine has the hghest torque rating that uses the gearbox and not go over that. If you decide to go beyond that, then it does not mean it will fall in a heap, just that it might not take much for something to go wrong.
On the torque capacity of a clutch, you would need to get some information from the manufacturer to see what they set as the maximum torque. This highest engine torque that the clutch is used on is not necessarily an indicator of the torque capacity of a clutch.
In the end, you have to use the lower of the two values.
In the main, a slipping clutch is an indiator of a worn clutch. Even with a higher output engine, you should not have a slipping clutch unless the clutch has had a hard life where it has been slipped under load and so worn.
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