Well, I haven't looked at my plugs yet but, did put some booster in the tank. Set my timing back to 10 initial, and it runs good now. No more ping. I have a couple more seemingly dumb questions though.

1) When I had the bigger cam, I didn't notice any ping. Why is that?

2) I can't seem to find anything better than 91 octane other than one guy selling racing gas for 5.00/ gal. Can I run the lower octane with the boost? like 89 or even 87?