What should my timing be set at to stop pinging at wot

If it really has that much cyl pressure, it would probably make more power with a larger cam anyway.....spark knock or not.

It really has that cylinder pressure , I was surprised when it was measured . Can you suggest a cam , but I have power brakes and it is a street car that hits the track 3-4 times a year . It's making 412 hp now , edelbrock air gap , 650 AVS ,headman tight tube headers with 2 1/2" exhaust .