12v cummins pushrods for sale

I have a 12v. Interested in Series 5... what is the ideal setup to run with these? in regards to any other modifications... like the tappets and such?

I bent some stock ones on mine. I make right at 1k probably.
 
Bumping these up I still have several sets of series 3 left. as well as some 24v pushrods.
 
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