I've been hunting down a 75 distributor but as of yet I still don't have one. I was looking at what I do have and one is not something I've ever seen. It has 2 of the oval openings in it and they are one highr than the other and not positioned the same as say a stock 72 would have. It also has 2 plugs in the bottom of it that none of the others do. The plugs have a triangle spot like a screw driver or something odd fits them. I can in comparison see a change in the advance curve in it. Any ideas what this is?