Hi,

The kit looks good, I'm not sure if you can replace the chain guides without removing the front engine cover. I could see them with the cam cover removed but couldnt access them very well. Maybe someone else has a better idea on this.

Basically your looking for any pitting or scoring on the cams themselves, checking all of the retaining springs to make sure there fitted ok. These are sort of U shaped metal peices not the valve springs. I've also seen in another post that you should look for different colour metal on the cam lobes, like stripes that indicates the rocker arms are worn.
If you have a feeler guage you can check the gap between the cam and each rocker arm when the cam lob is pointing upwards but unless you have the correct tool you wont be able to carry out any adjustment (don't try it with a normal spanner you'll end up rounding off the nut).

Good luck, let us know how you get on