if you can get "something into the head of the bolt, you might try gently heating the aluminum around the bolt before breaking it loose. Perhaps some penetrating oil if that doesn't work? But if it doesn't, you wouldn't be the first person who's had to drill out the bolts.
In the future, if you're running stainless bolts, make sure you replace them with grade 8 hardware with nuts on the back of the intake. SS and aluminum just don't seem to get along too well, and the grade 8 stuff is much stronger.
Chris