You have to do things in some logical order. Disable the camshaft from moving the valves. Then do a leak down test of all the cylinders Until you have checked All the cylinders for bent valves.

You can use a leak down tester and air supply. Or just compressed air listening for it escaping any cylinder. Anything else is not first on the list. There is the smallest chance you did not bend valves as the chain did not totally break.

Any concern about where the injection pump is at this early. Does not matter very much. You can do nothing as long as the valve train is intact anyways.

As said there is the smallest chance you did not really damage a valve. That means there is more of a chance you have.

If you have no cylinder leakage only then do you start getting concerned about other things in general. Just in case you do not know. With the valve train disabled. All cylinders can be tested for abnormal leakage without moving anything. Other than the air supply from cylinder to cylinder.

There is absolutely no way to do anything really without disabling the valve system anyways. It is not like there is any another option. Remember you must number all the cam followers as they have to all go back in their original positions.