From what I understand of the displaywidth command your calculation appears to be correct. Tested on real Amiga it also works - there is however no difference on my screen between the 336 and 352 width - both of them use up the entire width of the monitor (widescreen cropped to 4:3) through scandoubler.
Being from the school of blitz I always thought 336 to be the maximum visible display width anyway, but I guess it depends on more than that and probably monitor specific?
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