Are you telling us you're thinking about buying the Harland rocker arms and putting them into your engine? And the only possible issue is they might hit the oil baffles inside your valve covers? As the baffles are easily cut or ground I can't see how you would have a major problem getting the clearance you might need. I recently had a similar problem as my aftermarket chrome valve covers for my big block had baffles that were getting hit by my stock rocker arms and I just ground some clearance into them with my Dremel. And then you can also buy extra thick valve cover gaskets as well as valve cover spacers that would most likely solve any clearance problems you may have......................