Intake manifold is it stock..which gaskets to use

of course it's too late, now, but for future reference, you should use a left hand twist drill, and run the drill motor in reverse rotation to drill out the broken bolt. When you are drilling in reverse direction the drill usually catches and it will spin it right out. When you are using those screw extractors, there is always the danger of breaking one off in the hole and worsening the problem.
All my left hand expept for big one is broke..I bought a set from harbor freight and broke half of them...I don't know what is in their but their must be old stuff broke off ..its half hard and half the top of easy out...when i put it in i didn't even use much force and it snapped...