LT1 Intake Manifold Leak

Okay, I'm about ready to fix the oil leak at the back corner of the intakemanifold. I've read a couple procedures on doing it. One said to put a gasket sealer on the gasket before putting it on (like a spray RTV silicone sealer); the other one did not use a sealer. What is the best way to go? Also, do I have to take the fuel rails etc. off the maifold to do this or can I leave all that on?

I don't know about the LT1, but on the older 350's half the time we would just gloop a snot load of RTV on the valley ends instead of using a gasket because they never sealed right.