360 la

In my 360 tried rn12yc motor still pinged. Had timing set @ 18° initial and total 34 or 35. Cam is mopar 292 purple grind. 108° lobe separation. Advanced cam 6° @ the crank with kb107 pistons. Iron x heads. So had to change to rn9yc champion's. Now no ping and have vacuum advance hooked!