Yeah, I'm trying to keep some sensability in what I use. There's been a suggestion of running a little more duration (Crane has a cam with 224*/228* duration, with lift of .551 on each). So that's there.

GM sells a hot cam with 219*/228* and .525 lift with an L/C of 112*. I can't see going much past .570 on lift if it's a good fit for the engine.