The only thing that gets RTV is the corners where the LIM gaskets meet the rubber valley gaskets and that's only a dab.
Just make sure the opening is up to a gen v. Since the outlet is further up on it. That's if you had it set up with a gen 3 before. Use rtv on the corners only I have reused the metal gaskets many times before. You can also add a thin layer of rtv on the bottom and upper part of the gasket. I do it all the time. And if I ever remove it I just take it off with a razor
Gasket is like $12
Only thing I'd be concerned with is the pcv groove that is cut into the LIM.
If you are looking for a Gen V lim, I have a Gen 3 I modded to Gen V sizing with ported runners and plugged coolant ports. Happened to find it cleaning the garage last week.
Checked.. nothing there
Check again lol phone had issues
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