got the Fel-Pro 2901 rear main seals and measured them like Bill suggested.
They protrude 1.35mm / 0.053 inch on each corner.
I also measurded the leaking seals, and they protrude around 1.0mm / 0.039inch.
Now start sanding them down to 0.25mm / 0,010 inch, hope the will seal.
Ford 289 Camshaft Manifold Carburetor
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