Re: O.K. so what do you think of the front sprocke
IMHO, both of your sprockets should be mounted on a plaque and hung on the wall, with a small engraved plate: "Courtesy of (insert P.O.'s name here)". The P.O. didn't give your Duc a good home.
Also, IMHO that chain is thrashed, running on sprockets that far gone tortures it severely. Doesn't matter how good of a chain that was on 'em, those sprockets would ruin any chain.
Buy yourself some peace of mind with new parts.
Just my recommendation, DTM, I'm not slaggin' ya.