engine busting up

I have gotten most of the ping out but why does it ping when i give it more timing.

I tryd to give it about 15 int degrees and it pinged its axx off. I had to set it back to about 5 int to get it to run half axx. The Vac advance is fine and seems to be working.

It still bust up a little around 3500 to about 5000 rpms. I am going to stick my BIGGS 950 on it just to see what will happen and my buddy bought a Blue pump to go on it. I have anothe Mopar Dist I am going to stick on there for ***** and grins and see if it works.

Any suggestions for and intial timing start.