I know this has been covered before, but thought someone might have recent experience. 318 with Edelbrock Performer. After about 600 miles, leaking at china rails, front and rear. I used Ultra Black rtv but maybe not built up high enough? No issues at all with the intake to head gaskets and dowel pins are removed. I don't know which fix would be best. I bought a tube of "The Right Stuff" which several of you swear by. I also thought about making my own gaskets for the rails as the standard cork gaskets are too thick as usual for an aftermarket intake. I have a roll of cork gasket material and a roll of fiber gasket material that would take up most of the gap. Thanks for any opinions.