Re: Rubber Rear Main Seal
What you say makes sense, when I rebuilt my 351 20 years ago I bought a FelPro full gasket set, and it included a 2 piece rubber lip seal and the wedge type soak in oil side seals. I do have a later issue FelPro BS40048 and it's a rope seal with pipe cleaners and a small tube of silicone.
As far as the round rubber plugs are concerned, all they really do is provide a smooth surface for the oil pan gasket where it goes over the holes for the rear main bearing cap bolts. The concave side goes towards the bolt heads, my guess is they made them like that because the bolt heads are not exact so the plugs would conform a bit to be the right height. I think you would be fine making the plugs flat, it they are a bit too low add a bit of silicone, if too high just shave them off with a razor blade.
Thanks for making the effort to furnish gaskets and seals for these old engines!
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