Ill take a few pics when I get home of my brake booster line for you, but if you're running the truck intake, there's a nipple on the back side that the booster hose attaches to. If its not there you can buy the fitting at a GM deal for like $10 or less. It's just a quick disconnect fitting. As far as a LS1/6 intake, I'm not a 100% sure but imagine it to be something similar and I know they are on the back side of the intake as well. I have my transmission vacuum line attached to the throttle body hose on the left hand side, not sure if that's the best place, but it was open so I used it. The vent lines off the valve covers go either back to the intake or just put one of those cheapo advance auto filters on them for the crank case to vent.
Like I said, I'll take a few pics for you when I get home this evening.