Sorry wrong end of the engine was thinking it was front dist. location like B/RB not small block like Chevys. Looking at the pictures it appears Chrysler used a sealer on the thrust plate to block something like permatex #1 paste to seal the plate. So using the plugs in the front galleys is the safest method and do as recomended about drill a hole in plug and use the factory slotted plate to lube the chain. The drilled bolt still only feeds oil by any leftover from the lifter chamber by splash collection.