Probably about time-rocker adjustment

Buy ONE pushrod.... Smith Bros, Manton and others will sell one.
I was trying to find what I would need online after measuring and I look to have pushrods from a 273 4 barrel application along with the adjustable rockers from the same. I even got a melling part number. I was thinking about replacing them all since I have it apart. I was also thinking about a cam lifters and rocker shafts for the original hydraulic setup that would've come in my car originally. I don't want to rush my decision just on the fact I would rather be driving it than having it laid up in my garage.