How to??

I have researched the timing curve thing on this thread and have been running my motor no load for a couple days. 273 Hi-po pretty standard stuff. Lunati hydraulic cam a little bigger than the stock 235 hp cam but not much. It seems to like 15 deg initial or a little more but I have a stock 2V distributor with vacuum plugged and it goes to 45+ at 3000. Can someone post photos of how I can limit the mechanical advance, welding slots or springs or whatever? I have converted my distributor to the Pertronix ignition module and have not had it apart further than that. TIA------DR!