Pinging

I stated the car is pinging on light throttle...I had a vry light spring in the dist and the lightest stocker with it..was terrible...kkkkkkkked all the time under light load.very light...i checked the timing ..8 degrees and iv changed the top hat adv plate and put one in that limited my adv to 30 degrees[ slot length is .430] at a light 1650 rpm all in.[discconnected adv module]..for a total of 36 to 38 degrees..decided too light of a spring .took it apart put in two of mopars stock light springs and the adv is all in at about 28 29 hundred rpm...went back out and it still pings but not like before..step on it and it still pings but not like it was...pings on throttle then seems to stop while its coming on....any ideas...pls...j[360 reworked mopar 1973 dist..and sh3t for gas.