So I am looking to put together a new brake setup. I am looking at going with flynbye.com's new SS 5th gen kit for the fronts, 13" one rear drum conversion kit and using the wilwood adj. Prop valve from summit racing. I will be keeping my stock brake booster.

This is a street car so doesn't need to be a track setup, just looking for something stout as you can really never have too much brakes. Is the 13" too much rear brake? Thoughts on the wilwood valve? I don't want to create a frankenstein setup that chatters or can't be properly tuned. Thanks