If you lost the chain, as you know , you also lost oil pressure. The balance shaft bearing on the oil pump and the rods bearings are likely to be damaged from oil starvation. The cam may have gotten trashed from debris. Usually the head takes the cam out. Particles embed into the head and turn the cam down. Most times the head will clean up with some emery.

Pull the oil filter and cut it apart to check for debris.

If you do a balance shaft elimination you want to remove the shaft on the oil pump.

Sorry to hear about your motor. For 2.6 engine owners that have the balance shafts, make sure you keep the chain adjusted.

How long did the motor run after the chain went? Did it make noise and or seize or get shut off when it rattled?

Kevin