[Mike Bradbury]

Had to do the same thing to my freshly rebuilt 350 just last week. I had a brand new balancer and brand new timing chain cover. When I was getting the leak on my pan I thought it was my Felpro super seal also but it turns out it was the crank seal that was leaking in the same spot as yours. Not on the seal itself where oil would be flung by centrifgal force all over the place but just a slow weep in between the seal and the edge of the cover down onto the pan. The hardest part was getting the seal out without dammaging the surrounding steel, but it was not that difficult once it starts moving. I used rtv on the outside of the new seal and it worked like a charm.
To set the seal I used a short piece of 2" DOM tubing that had a .250 wall and it was almost identical to the seal diameter. I put that over the front of the seal and tapped the seal flat with a large diameter body hammer, not moving edge to edge but flat. Slow taps sent it home with no issues and solved the leak, but I wish I would have read this before I did it, your method seems a little better to get a good seat.