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once the timing is set it should not be changed. use the idle speed screw, at least 850 is usually a good choice.

just to be clear, my explanation is for replacing the pump on a known good formerly running truck. putting a pump on an unknown engine or one that is apart and out of time is only slightly more involved. the key to installing any of this is understanding the relationship of components in a 4...

no, it turns at crank speed, but the HH turns at cam speed. don't over think it.

for what you propose to do there is no need to remove valve cover. there are two possible timing positions, only one is right. remove shutoff cover, remove timing pointer cover (4 small bolts) turn engine until pointer under timing cover lines up with mark exactly. look in shutoff cover to see...