http://www.firehawk.net/article/1336.html
Or
On the LT1/4 it's not a big deal.
- Pull off the "CORVETTE" beauty covers.
- Disconnect the various electrical connectors
- Remove the nuts that hold the electrical harnesses to each side of the intake
- Move the harnesses out of the way
- Remove the 4 bolts that hold the fuel rail in place
- Remove the fuel rail/injector assembly from the intake (leave attached to fuel lines and simply set it on a towel on the windshield)
- Remove the throttle body and the throttle cable
- Remove throttle cable bracket
- Remove any misc items/hoses...PCV valve & hose, AIR connections, EGR (on the LT1), etc.
- Remove the intake manifold bolts
- Remove manifold & old gaskets
- Clean, clean, clean the sealing surfaces
- Clean intake bolt threads
- Install new gaskets
- Apply RTV sealer to the block for the end seals
- Set intake in place. Apply liquid teflon to the intake bolt threads and torque bolts per Factory Service Manual specs and sequence
- Reassemble the remainder in reverse of above
That pretty much covers the major stuff.
3 to 5 hour job. 2 or slightly more if you can really spin the wrenches and everything goes your way.