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1 - It's been a long time since I messed with Neon engines. Tempted to say on the order of a millimeter, but could be off. Shouldn't matter if you use a sleeve, though. It just needs to block the holes enough so that the rest of the valvetrain can still have an oil supply. Aluminum sleeves, with the same diameter and length as the rocker arms, should work well enough for your needs.
2 - The rocker shaft itself is stationary. The mounting bolts even go through it.
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