Quote: ping at half throttle suggests the timing curve is too aggressive. A slow mechanical advance with full advance delayed to 3000 RPM may help.
I had the same pinging issue with my street 512. Similar build only with Indy EZ heads and Gear Venders. I recurved the distributor, MSD billet. I had the silver springs installed to get full advance at 1800 RPM. Good for a race engine not so good on the street. I replace one of the silver springs with a blue spring to slow down the advance. Problem solved.
