Hi there
you are correct on the stock hp/tq numbers for an auto truck...
boost pressure stock should run around 18 psi max
the 01+ ish (some 01's have forged rods that were still left over) rods are PMRs and are only weaker at high HP levels.. generally speaking, you are safe up to 400 HP with the stock rods in an 01+
With your Evo - you won't be running anything too serious - so you should be fine.
the 6.0 basically comes from the factory "tuned", so when you start adding tunes and mods - you get way more hp quickly -- which is why many believe they were having so many problems b/c they are already "maxed" from the factory
hope that helps