A reputable shop went through the new heads. Do you know if they checked valve stem to valve guide clearance? Seems to me that was a known clearance problem on some Eddy heads. (Too tight)
Also, nothing mentioned yet about correct pushrod length. A lot of things were changed affecting valvetrain geometry since it last was running right
Seems there are a lot of possibilities here and every one will have to be methodically checked and crossed off the list.
