When to change cam chain?

[oynot400]

Well if you don't know I am in process of in stalling my FDO 463 stroker. :macho Everything will be ready to ship next week. I was thinking when I do this will it be a good time to change the cam chain? What are some of the signs that the chain needs to be replaced? I see that Sparks offers a heavy duty chain, Will the stock sprockets work with that chain? The cam I have is not that radical of a cam, in time I plan on doing a different cam. Is the cam and valve train what is hard on it or is it the bottom end?
Sorry about all the questions but I want to get all my ducks in a row so I can tear it down and put it right back together. :D

[yellow_ho_01]

one sign i have now, is that you will start to hear it going bad. It might sound like a valve.. but in my case its the chain. I have replaced the tensioner already.... and now i know the chain is stretched... i have one on the way.