I replaced the rear seal on a 70 455 a couple of months ago with the crank and rods still in the engine. One of my brothers spoke to Butlers about it and purchased the seal from them. They actually advised how to do it. It was a two piece seal. I took the mains caps off, then gently raised the back of the crank up. Pulled the rope seal out, and cleaned the seal area. Clocked the new seal how I wanted it and seated the crank and assembled like usual. Worked fine with no problems and was surprisingly easy.
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