I'm on a quest to fix the oil leaks on all my cars. I want to re-seal the 472 hemi in my 69 charger. It currently has stock 69 valve covers and oil pan w/windage tray. I used cork gaskets with a little black RTV when I assembled the motor in 2009 but they're all leaking now. I see fiberglass reinforced gaskets with steel cores now. What works the best? Should I upgrade to vast valve covers to get a better seal? Does anyone make a cast oil pan or something with a really thick machined flange?