Replacing the valve cover on a 1981 CJ7.
I have a 1981 CJ7 the has a leaking valve cover. I ordered a new cover from Quadratec built made by Crown. The new cover came with the gasket and all of the hardware 5/16" bolts for the sides and 1/4-20 bolts for the ends. I started taking the old valve cover off and discovered the three bolts on the right side of the engine are unique in that that have a 1/4-20 threaded surface about 3/8" then there is a 5/16 shoulder on the bolt. As an added treat the rear bolt on the current cover is broken. So I will have to drill that one out and re-tap it.
On the left side of the engine there 3/8" studs going into the head these have a nut holding the head on and a secondary nut with a collar that catches the valve cover to secure it. The new valve cover does not have any shoulder for these retainers to catch and apply pressure. In addition, there are two holes in the cover with no corresponding holes in the head. My questions are as follows; do I need to drill and tap the head for the two 5/16" bolts on the left side of the engine? Where can I buy the unique bolts holding on the valve cover? Has any one else dealt with this issue?