Looks like your valve stem oil seals are not sealing. Could be the wrong size oil seal for the valve used (0.3415" in. stem versus the stock 0.3750" stem). Would be really bad if some one installed high performance 0.3415" in. stem valves in a 0.3750" stem valve guide. You would not only have the oil leak you see but the valves would never fully seal and will wear/burn at an accelerated rate. Or it could be that the person who assembled your head left the valve stem seals off all together for unknown reasons.