I have a 1600 DP in a '71 Westy. Engine is basically stock with Kadrons and extractor. Went out to buy intake manifold gaskets this AM and was shown 1)bakelite gaskets, 2)metal gaskets, and 3) fiber gaskets. Checked the archives and got mixed reviews. Which one is best at preventing leaks? Which one would be best for this application? As always, TIA.TBear