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I see Uncle Tony here saying (1 min into the video) that the vacuum advance / retard pipe should be connected to the PORT side of the Edle but it's been piped into the MANIFOLD of my Holley up to now...

https://www.youtube.com/watch?v=aBbD_JlKBGY

I'm waiting for a new Power Valve but when it's fitted I'll be happy to test it and change to PORT ~ but is he right?