thanks again ed for that set of 340 exhaust manifolds(553,549), good to have a guy like you as a member of this site that aren't all about making a big buck on helping someone out. one of the best 400.00 i've spent. good luck on your project.
why don't you just get it rebuilt, also if i am not wrong MANCINI'S will exchange yours for price of a rebuild (800-843-2821), might be cheaper and will be brand new.