Magnum 5.9 Magnum Rebuild: What can You get away with?

I'm running the Hughes retainers on my 5.2 with 1.72 roller rockers that put me at .538 lift. I have about 10k miles on the engine with stock rods and pistons. I shift it at 6200 quite often. The rods and pistons have over 100k on them without any I issues. I know the 5.9 will be different because its a longer stroke engine. I needed the offset retainers to get the installed height correct for the springs. I had to have my valve guides cut down for enough clearance for a .550 lift that I was expecting from the 1.72 rockers. Hope this info helps.