sounds like carb icing, mine does it around the base,appears like water but smells slightly of gas, does it smell alot like fuel or just a little? is their a gap under the intake causing it to run cooler? i thought their was a gap on some v6's i know if the intakes aren't warmed properly they can "ice" in vw beetles(tangent) its not common but some unheated intakes to cause carb to freeze and throttle cable to get stuck. i'll take photos of mine when i drive it tomm, see if it looks similar.
btw mines a 292i-6 but sounded similar to carb icing so figured i'd throw it out their. and this site has alot on those motors
http://www.6066gmcguy.org/