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Or, you could make a chart like the one below, install each rocker shaft with rockers and pushrods, carefully align each roller with the valve tip and measure the gap between each rocker. Deduct the required clearance between each pair and order enough spacers and shims from Comp Cams or Hughs Engines to do the job.
Make sure you keep the rockers in the same order if you ever remove the shafts from the heads. Worked for me...