my manifold must have warped as its snapped off the upper and lower studs for the front-most port. can any mechanic/exhaust place remove the studs and machine the manifold?

will the manifold definately need to be machined or will a different gasket fix the problem?

what sort of price range am i looking at to have either...

a) just the 2 studs replaced, with manifold being taken on/off by the shop.
b)as above, but with the manifold being refaced.

thanks.