engine tear down help

ok so ive done ALOT of work since i last posted here. i have some questions since ive never done an engine before. i need to split the cases so i can clean them all up replace gaskets and paint. my question is this: do i split it right side up or upside down? and do i need to remove any more parts? i have the sprocket inner cover romoved exposing the linkage. the timing cover pulled back, and the clutch removed.

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and i assume i need to remove the rest of the pistons