Setting the timing on a 69 318

i have a 69 318 that had a complete refresh basically a stock set up may have slightly larger pistons due to wear on the bore but a stock cam. The 69 service manual says that the timing should be set at 0 top dead center. The first test drive noticed while climbing a hill it pinged so what do you guys suggest where the timing should be set at for this set up. Thanks in advance
Pat Faley
69 barracuda convertible
67 barracuda notchback
East Peoria IL