Identifying ping (detonation) with loud exhaust

[Mrturner1]

Hey guys so I'm still tuning my truck in and I'm wondering how to identify ping when you have loud exhaust. Also wondering if timing will change the sound of your exhaust. My exhaust is fairly loud I have a long tubes and flow masters dumped, and I noticed that when changing the timing it sounds different under acceleration and it made it kind of flappy when I rev or drive it. When I gave it a little more timing is when it seemed to make the exhaust sound flappy and there was a slight noise under acceleration but I can't tell if it's ping or not because under light acceleration or hard acceleration flow masters make a lot of noise and some of it is kind of like the high pitch tone of a ping. Another thing I noticed when I gave it a little more timing the RPMs didn't drop when I put it in gear as bad, maybe only 200 RPM a set of 400 like it was before.

Let me know what you think guys. I've been playing with everything from 32 total to 38. It's a 9.5-1 or 10-1 SBC with a Comp 280H, 67cc RHS heads and edelbrock rpm intake and 650 AVS carb, GM HEI