I'm running a 496 w/ Canfield 310's, RPM Airgap, factory spec LS6 cam (good deal smaller than yours) 850DP. Stock set up was almost perfect. Just had to swap in the orange pump cam, but I think that has more to do with my 4.11's. So, I'm running 80's front and back with .031 shooters front and back. I imagine you'll need more jet in the back than I'm using.