I have one in my 408. Love it !

Advance is pretty easy to set up per their instructions. You will need a set of Mallory advance keys to set it up. These are used as spacers to set the curve. I am sure you can wing it but I don't like R&R my dizzy that much. Just out of curiosity I looked on summit and jegs and both said unavailable. Kinda strange. The Mallory part number is 29014 and includes springs. Not sure they sell just the plastic keys. I found a set on ebay that the guy wants $58.00 for so they must be out of production or something now. I bought mine at summit a couple years ago. I want to say they were around 20 bucks.