My advice is that if you're going to push the lift up into the 0.800 range then you really do want to invest in some high quality rocker arms such as T&D. I converted my EZ heads over to Jesel rocker arms but that takes machine work and some special parts so that isn't the path for everyone. A T&D shaft system should be a bolt on and T&D makes killer parts. But anything over 0.800 lift becomes an R&D project. You'll need to spend some time sorting out retainers and locks and spring cups to get enough installed height. You'll also need to spend some time researching valve springs in order to find a set that clears the rocker arms but still has the capability of handling .800+ lift. Unless you're really familiar with all of this work you might be better off sending the heads to Porter Racing and just having Dwayne sort it all out for you. He can do this stuff in his sleep. Or maybe CompuFlow already set the heads up for you??