There is basic differance in geometry between shaft rocker system and stud mounted rocker systems----in a shaft system the valve heights and shaft heights should be worked out so the geometry is correct-----

In stud mounted systems everything is sorta self cancelling and somewhat forgiving---however every one puts in longer valves, changes rocker ratios from 1.5 to 1.6----etc

with the adjustment being done via the height on the stud, the pushrod length is how you correct for geometry---------

In this system on the mopar, the shafts are upside down with oil just squirting freely upwards and not lubing the under side of the rocker shaft ot the rocker----then the adjuster screws are screwed way down almost half way thru the lock nuts----they look like they are 7/16-20 thread which would equate .050 per revolution of the screw--so count the number of threads that you need to lengthen the pushrod---multiply by .050 and add that to the length of the current pushrods---they seem to be at very least 2 full turns down into the lock nuts plus are probably overextended 3 or 4 turns more underneath the rocker body---------

I don't believe you read the full article, probably only the studff about the stud mounted rockers-----------