This probably won't need a lot of introduction!
Use this PCB to build a clone of the Death By Audio Fuzz War.
This is not the rough first version of the Fuzz War circuit that used 7 transistors and a lot of viciousness to work but the current model that is based around the EHX Big Muff.
The tone control goes from super bright to absurdly muffled and the 4 transistors give you all the gain you might need