Pinging at higher rpm

Got my dart back on the road recently
Noticed a ping at higher rpms
Engine is 340 with msd billet dist and 6am ignition. These are new had mp ignition before
When I had the engine dynoed the best run was at 36 degrees total timing.

I can't remember what springs I put in the dist but it was light just not the lightest

Car is a 4 speed

Looking to get a recommendation for which springs I should run and bushing

Any help is appreciated

Thanks
Justin