Are the factory pushrods compatible with the 273 rockers? I thought the 273's need ball/cup and the OEM stamped rockers are ball/ball? Not to mention the length may be different even if you have compatible adjusters? Still a win to go with the 273's, even if you need to get pushrods. I'd slap a single rocker in for the bad one temporarily and work on fitting out the new adjustables.