Ahhhrgh, they all have 8 pots mate!
Pinging is like DNA. It's different for every vehicle
(comp ratio, CC size, stroke, cam, etc etc).
Loud though your car may be, you'll know pinging when it strikes. It's more like a "rattling" sound from your engine under load or acceleration. You'll develop an ear for it so you can hear/feel the earliest onset. Very bad for motors and to be avoided at all costs.
I guess you'd have your initial timing around 10 degrees? which should be fine. As long as your car is perky off the mark and doesn't bog down, your timing is generally OK. You could advance the timing in 2* increments to see how performance changes. If it improves good, but eventually you'll run too much, causing your car to ping (rattle), then nip it back 2*.
The 98 RON fuel allows more timing, reducing the onset of pinging. If you set your timing on 98 fuel, then used normal ULP, you'd expect some pinging.