The only gasket I have had issues with is the base gasket if touched for some strange reason. It's sililar to a halogen bulb. Once it is contaminated it seems to weep a bit. Best way is to wear fresh rubber gloves and use permatex sealant 515 I think it's called both sides of the gasket. No oil or grease anywhere near it and it will be fine.
Side case gaskets, I use stock gaskets and have never had an issue Head gaskets, either stock or already machined out for the big bore kits, again never a problem.
Carry on Gents...all's good.