Here's a good one for the Zonk. This pedal used to belong to David Main, and is the one that he traced for the schematic that everyone has used subsequently.
http://youtu.be/oJfb0D5wFzUFor the FZ-1 you could just listen to Satisfaction by the Rolling Stones.
These are temperamental if you have plenty of appropriate transistors to use. If you don't then you pretty much have no chance with the stock circuits. You need transistors with leakage to get them to bias up, and they need to be pretty dark sounding to avoid noise and screeching note decay issues. The input cap on the Zonk is 1n, which would normally be extremely bright sounding. If you notice in the video it really isn't too bright sounding. That is all about the transistors.