Edelbrock oil leak. Finally figured out why!

There are some well known casting issues with various brands of manifolds - for instance, Weiand Xcelerator manifolds for Ford Cleveland motors very rarely seal properly and need decking and port matching to work. This has been reported to them many times and as far as I know it hasn't been fixed.

How does JBWeld stand up to heat? Would hate to end up with a piece in the motor..