I ran into this problem a few hours ago and called it a day. The problem I am having is the old heads had the studs in them the new ones dont. So that means my pushrods are to short? Is there a way to put the old rockers on the new head. The old rockers have the rail type and the new ones dont. They just bolt to the head so that means you can adjust them. I need help I would like to drive it by monday if possible.