Unless you're running solid lifters, I don't see any advantage of running the 273 adjustable rockers on a hydraulic cam. If your shafts are good, just buy new rockers to go on them and new push rods.
The advantage is a better rocker & less flex with a more accurate ratio and a longer service life potential with bigger cams.
The OE stamped rockers are notorious for having less than a 1.5 ratio. With stiffer springs they tend to wear out in the pushrods cup area. They are fine for low lift mild spring cams.
