Mopar Performance Distributor adjustable advance?
First, throw the FBO plate in the nearest garbage can. They're worthless, because they are inaccurate pieces of CRAP. Say you install it on the "16" slot. You'll probably get 20. And so on. They just give way too much than what they're marked for. Everyone on here who has tried one has had the same result. Several of us have told what's his face about it but been ignored and he was even rude to me about it, so screw that guy. I just weld the governor slots now. Yours is a later MP distributor made by Mallory and those are NICE. See that little black screw at about 11 o'clock on your last picture? That's how you adjust your mechanical advance. Easy peasy. Screw that FBO guy.