My 422 smallblock build

Now remember my pipe plug (3/8) will be smaller than your because mine is drilled out to 1/2 inch. You will have to tap it for a 1/2 pipe (tapered) thread. I always like to fit this up before I but my crank in so I can stick a 1/4 inch metal rod in the number 1 main bearing hole. Block the feed hole and you are screwed.