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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.
Free advice and worth every penny...
Factory trained Slinky rewinder.........
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