[JET]

The balance shaft on the oil pump shaft is probably what is bad, not the oil pump itself. You will need to replace the bearings for the rear balance shaft and probably the shaft itself. You can bypass that if you do a stubby balance shaft elimination. Your valves will be toast, so look for a new head or if you have plans for this one, put in oversized valves and get the head rebuilt now. Have someone knowledgable look at the pistons to see how big the dents are.