The pushrods are non adjustable type. The rocker covers have to come off. Once the TDC is set for front cyl. You do have to follow the same procedure as the adjustables type, in the bleed down procress. Is this the case in the process.
http://www.hdtimeline.com/archive/t-3025.html This link explains the entire procedure. If you can,you should try to get some aftermarket adjustable pushrods. More precise adjustment and don't have to remove the rocker boxes to install.