so i buttoned it all up last nite, added a bottle of lucas oil zinc break-in lube, did a quick double-check of all connections, primed the fuel rail and boom! she fired right up and idled quietly. i was listening carefully to the valve train and inspecting for leaks as she warmed up, then noticed a huge plume of steam coming from my tailpipe... couldn't believe it. i watched the temp and pressure and waited for the thermostat to open, keeping an eye on the overflow bottle and expecting all kinds of drama. oddly, it continued running well, completely normal at the gauges, not pressurization of the overflow bottle, and a steady plume of steam from the tailpipe which stank of propylene glycol. i decided to drive around the block just for kicks, and when i got to the gas station to fill the tank the steam was completely gone and she was running perfectly. so i think what happened is my headers had filled up with coolant when i took the head off and that was boiling off during the warm-up. that is my sincere hope at least! i will drive it today and see how it goes - fingers crossed! internal cleanliness notwithstanding, as mentioned in the previous posts, the head seems decently prepared as far as setup and machine work. i didn't find any damaged threads or any other issues - all looked fine. after a couple hundred miles i'll do a lash adjust, compression test and check plugs to see if the oil issue was in fact the valve guides and not the rings... it does feel great to have her running again!