Didn't feel like going with the advice offered in the other thread then?
OK, as others have said, go through this methodically. You may well not need a new engine, but if the cam chain has jumped on the cam or crank teeth and pushed the valves into the piston it's possible the engine's dead. This may not be what's happened but we have to accept there's a fair chance of it. A lot of the time you will need new valves or a new head and the piston and rest of the engine will be fine. The problem is, this has now gone from an easy peasy job to a relatively involved one.....
Best of luck.
Jambo