Does your Lark have a generator, and if so do you intend to use it? Makes the electricals more complex.
I see a cobweb in your pic. The magneto likely needs a rebuild, likewise the water pump. You don't need to run the motor to do the magneto and pump, but will likely want to run it to test -- can do that while looking for cables and box. Take off the generator belt, if present -- absent the charging apparatus, the motor can be safely run completely manually. Either pull it over manually with the motor on a secure stand or a boat transom, or rig a simple solenoid and button starter assembly to test. Flushers don't attach well to that lower unit, and best to test in a deep barrel anyway -- water well over the pump.
