It's not really a good idea. Intake vacuum can draw sealer into the engine, and most sealers won't survive exposure to exhaust gas temperature. Clean, dry, and straight surfaces are the key to getting a good seal on the intake/exhaust flanges. Make sure the alignment rings are in the intake passage counterbores to keep the gasket positioned correctly.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!