ZZP VC gaskets are made for their aluminum valve cover. Which are slightly smaller than a stock. They are also a harder rubber and dont' come with grommets.

Here's ZZP's in a valve cover. Look at the bends.





Their LIM gaskets are also goofy. They just don't fit right.

Me, I personally buy GM LIM's, Fel Pro VC's (with grommets), depends on which charger I have/using/IC etc, fel pro TB, Dorman elbows. All sourcable local with discounts.