The method demonstrated in the manual is the way to find if the pushrods are the correct length...you collapse the lifter plunger and then measure the rocker arm to valve stem clearance...this is done on the heal of the cam lobe.
You can adjust the rockers all day long...but if the pushrod length is not correct...you will not achieve correct valve timing or correct valvetrain geometry.
This procedure needs to be done after a valve job, a cam change or any other operation or component change that may affect deck height.
O/S and U/S pushrods are availble for service from FORD as well as all the major aftermarket cam manufacturers.
Hope this explains what you saw in the manual...FORD service literature will be more explanatory.
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