I am having problems with the 2 piece rear main seal leaking on this 73 350. I've replaced it twice this past week. The first time I took a little of the seal off installing the top half. The second one I tried something different. I put the top half in leaving about 1/4" sticking out. I set the one in the cap to fit the top. I put permatex anaerobic sealer on the seal and the metal cap. After torquing everything thing down it still leaks. Any suggestions on what I need to do to fix this leak issue? Any thoughts are appreciated.