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That play looks normal, you're moving the mechanism against the mechanical advance springs.
If your engine is pinging, typical issue is is it has too much total ignition advance. What is the initial timing set at? Should be around 10 - 14 degrees of initial timing, with total advance no more than 36 degrees total.
Also the quality of the fuel has a lot to do with the pinging (pre-ignition). If it's a higher compression engine than the quality of fuel you are putting in the car, it will ping.
We have 87 octane regular quality unleaded at the pump and you usually can't go over 9:1 compression.
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