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After 60 years of changing spark plugs in many different motors I use the “Good and Tight” method of torque. You develop a ”feel” for torquing things after a bit. Never stripped a plug or head. Changed plugs in my 2016 453 not long ago. I wouldn’t, however, recommend this to someone without experience. Be nice to have the spec.
 

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From what I have read, the torque spec should be about 13 lb-ft (18nm), which is not that much as far as I can tell. I just use the same amount of force that I used to remove it (rough guess).
Keep in mind that I am not an expert, just another 453 owner that recently changed spark plugs.
 
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