Hi Kelvin
That kinda gunk is normal, its exhaust gas mixed with oil from the breather terrible stuff that takes 40 years to get off your hands. Its the same on mine, it goes all the way into the inlet ports too so it would be best to remove the manifold and clean it as well as wipe it away in the inlet ports.
The lagging does not seam normal, a lot of people think it goes better when you remove the egr, however I found it stayed the same.


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