[Superman]

When I changed my ramps and tensioners, I wondered the same thing. Should I replace the chains and perhaps the sprockets? (You see, the sprockets should be changed at the same time since old sprockets will stress new chains) Commentors reported that chains are replaced at rebuild time, but not in between. Don't worry about it, they said. Indeed, what I found when I rebuilt the engine at 183,000 miles was exhaust valves that were a bit worn, and rings that were at the edge of spec. Bottom end bearings were still serviceable, but showing wear. Especially the layshaft bearing and the rear main. So....if you knew the condition of the other parts in your engine, you would know that many of them match the degree of wear you're seeing in the chains and sprockets. You never know when something bad might happen in an engine, but odds are that your engine is not ready to start throwing parts. Indeed, your Carrera engine probably has more valve guide wear than anything. That's probably your engine's biggest enemy right now anyway. Worn valve guides.

The point of this is to just be careful what you worry about. Lots to choose from. One good option is to button her up and drive. These engines are not finicky, short-life engines. It'd probably enjoy a track weekend more than a chain replacement.