Most adjustable rockers use ball and cup pushrods, so yes, you will need new pushrods. At .500" lift, you are not stressing the valvetrain, so those rockers will probably work for now. But as your engine develops, the demands will become higher, and you will be needing different rockers. H/S are so popular, with a little searching, you can find a used set with shafts for the right price.