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Using stock non-adjustable rockers and hydraulic lifters you need only bolt on the rocker assembly,find the distance(adjustable pushrod ball&ball ends)and at rest,valve 100% closed add your desired preload(start the plunger downward)Lock your adjustment on the pushrod and you have your proper length.Make sure you are on the(bottom) of the cam lobe at true basecircle. 
And now for the real wrinkle.If whenever the valve job was done, if the heights of the valves weren't equalized (across the tops of the valves) you will have to check every rocker. If you drop a straightedge across the top of the valves and the heights are all over the place, you would either need different length p/rods for each rocker, have to have the ends cut to the right height, or adjustable rockers.
aren't we overcomplicating things here? Isn't that part of what the hydraulic lifter's function is for, to soak up the tolerances in the valvetrain? yes, check every position with a length checking pushrod like johnahhahh suggests making (or just buy one) for 0 preload on the lifter plunger, and then look through the summit catalog to find the nearest length pushrod not shorter than that number, and you'll be fine. on a mild hydraulic cam, you won't have aperformance difference if you have .010 preload or .080 preload. it's just not that critical.
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2011 Toxic Orange Dodge Charger R/T
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