I installed a "B" manifold and had a stat housing leaking.Replaced the housing with a NOS one.Still getting seepage around the top edge.i have tried 3 times with different gasket material and checked the flatness on mating surface of the manifold.Now after having a look at the manifold I took off I can see that the machined surface where the housing bolts to on my replacement manifold is VERY narrow at the top edge and this is where it is seeping.Has anyone else run across this problem?I thought maybe using the coldweld kits you can buy to try and buildup the area at the top edge where it is too narrow.