The best gaskets were the factory ones. They were also sold as a MP product. Unfortunately they may be hard to find since I believe they have been discontinued. The gaskets I am refering to are grey in color and are ribbed rubber with a steel core and plastic grommets for the bolt holes. They seal really well and are almost infinitely reuseable. I use a thin coat of RTV on the valve cover side at least when using steel valve covers. Nothing on the head side. I've had the same set of gaskets on two different engines and they have been on and off more times than I can remember. Still seal perfectly. I was able to find a spare set at the Indy swap meet/trade show a couple of years ago and grabbed them up. You might find a dealer somewhere with some old stock. IMO they are better than anything else out there. Good luck.