I use silicone on the intake gaskets as right stuff is expensive but works too. End seals is where I use right stuff.
I used to glue them but don't like cleaning that later so I let the silicone cure some before tightening and never have pooched one out.
Before I tighten I wiggle the manifold to get the best port match I can.
Snug it and let it set awhile before tightening.
I use an engine lift plate with 2 gaskets to pressurize
I take mine to about 10#, they usually leak at the lift plate because the steel plate is too wimpy and needs more fasteners.
You know it immediately if you have an intake gasket leaking though.