318 camshaft timing question

MV8 said

For the ping, is the trans kicking down?
For less emission at the tail pipe, less initial timing, higher idle, leaner idle, test egr with vacuum applied for rpm drop at idle, air pump working, cat working, loosen exhaust clamps, rubbing alcohol.

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Yes, the trans kicks down. It pings with or without it kicking down. As far as the exhaust goes, it had dual cats on it, now with the stock single exhaust it only has one. (Haven't taken through inspection yet with the stock exhaust since I just installed it last weekend). EGR is hooked up and functioning properly. No airpump. Was seized up when I bought the truck and never fixed it.
I have tried 3 different distributors, and best results are with the MSD since I can change springs and limit bushings. I'm using Champion RN11YC plugs. 8.5mm MSD plug wires and blaster 2 coil.
The current 390 Holley has a 10.5pv, 55 jets and a 28 squirter.
I had used in the past an Edelbrock 1406, 600 Holley and a 650 spreadbore Holley all producing the same results in the pinging department. The 390 gives me better MPGs and throttle response.