I'll make it as quick as possible. Currently a very small cam .507in .507ex, 5.9 Magnum, with eddy heads part # 61775 which are setup for a Hydraulic Roller camshaft. I've decided to do the 408, but as I am already a chunk of money into therlse heads, I figured I'd buy there shortblock and use these heads. I know similar setups have been done before, but would still like some help choosing parts. And also if I should stay Hydraulic roller. I do want to upgrade to something more in the .550 lift range. I realize I'll need linkbar lifters, but other than that should be straight forward.