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cylinders don't have to be adjacent... if one has low compression it can be leaking compression out the side, to an oil or coolant passage, etc.
You will need a deep 10mm as the cam bolts that hold the valve covers are long
you don't have to remove the intake manifold to get the head off, just make sure you get the support bracket unbolted.
you don't have to have it resurfaced if it isn't a problem.... have a very good and straight straightedge to check both the block and the head. When I have done HG's on toyota's in my own garage I have yet to find an A series that required a resurface.
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