Exhaust manifold...

[slategrove]

I have the 250 c.i. I6, and had a pretty good leak from where the exhaust gasket used to be (hence the leak), when I went to replace the gasket, the nuts would just start to get tight on the bolts, when they would realease and get loose again...so I still have a hole between the exhaust manifold and the exhaust line.

Do I have to find a new manifold, or can I cut the bolts off, drill them out and replace them with new bolts? Never done that before so, I'm sure I need to use the "right" stuff with as hot as their going to get...can anyone shed light on if this is what I should do, and what I'm looking for to do the job?

Thanks,

Slate