Stuff leaking out of ignition box.

This truck has a high speed miss starts a random miss above 4000 rpm . I tried a new coil and it still misses. I was looking things over and noticed what looks like something leaking out the ignition box. Is this a sign the box is failing or about to fail? What is a good box to replace it with? 1978 D150 rebuilt 360 motor, small cam, headers and thermoquad like demon carb. Lil red express.

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