If this is a stock manifold, and it was welded once already, I'd trash it now. Cast iron is hard to weld, specially if new metal has to be introduced. Headers arn't that expensive, even from MSA. You can easily find manifolds in the junkyard. If not I'm sure someone on here will give you theres for the price of shipping. If I still had mine I'd give it up, but it broke while I was taking it off.