I would check the write up for the LIM gasket replacement. It will show you where you should place the black rtv for the LIM gasket. Make sure you get the aluminum LIM gasket from GM if you haven't already. Check the oil pan gasket for tips and information for that area.
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1998 Supercharged Riviera - Custom CAI, Alpine spx-13ref, Infinity 6x9's, Alpine 4 Channel Amp, Kicker KX3, Silverstars, STB, Hawk Brake Pads, Monroe Air Shocks, KYB GR2