spark advance

[Dave Dta]

Looking for experiences. I have rebuilt my engine, .080 over, insert rods and mains, using B police head. I timed per standards, can only add about 12-15 degrees advance, then it pings. I checked with a timing light on the setting. Runs strong, just thought I could go a little more than I can. Any input using Brumfield 5.5 head-does it act similarly? Thanks, Dave