A plain ole 350, the plug don't look damaged. A piece of carbon could have done that, but it would be rare. You can run a compression test on that cylinder, then on another one and see if they are close.
Put a set of AC R45TS's in check the gap on all of them b4 U put them in and see what happens, like said already probably installed that way, it wouldn't be the first time a "Brand New" plug got dropped @ some point bending the ground electrode, or on the cheap side re-gap this plug
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