so i pulled the intake apart and i found oil up the number 6 intake runner, and when i pulled the lower intake there's buildup all in the cylinder and the other seven are clean and shiny, the motor is brand new only 3K miles on it, oil changed every 1K miles, and the heads were rebuilt using the same valves but new springs, valve seats, retainers, and a three angle valve job. the heads were also straight so i didn't mill them. does this seem for sure like a head gasket or anybody have a suggestions before i pull the heads??