I can't say for sure but I think the summit billet distributors are made by mallory, though I don't know which exact mallory model they are. They use the same advance mechanism (with plastic tabs used to set), cap and rotor (the rotor has a mallory logo on it), and they have the same instruction sheet as is found on mallory's sites for the YH advance mechanism. Same wire colors too

I have one on a 440 and I'm happy with it, have had it apart a couple times to change the springs and advance limit. It comes with springs and charts to choose when the advance starts and when it'll end, based on how much advance you have adjusted it for. I have mine setup with ~15 degrees advance, and have initial about 21 degrees btdc, it is all advanced by like 1900 RPM, and starts advancing at about 1200 RPM with the springs i put in it (1 brown, 1 gray).