My opinion;all looks good and normal burn paterns.I'd put another 50 on that piston and rings easy.I wouldn't get too hung up on gasget stack dimensions etc.There's plenty of surface area there to accomadate a number of gasgets.Pick a number and stick with it.
It's the massaging of the head will give you the most notible gains-squish,cr ratio.
No doubt pastor Jake will add his sermon about this subject.
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