I have 1988 Wagoneer XJ, the motor now has a rattle/knocking sound, and lost some oil pressure, while not really lacking perfomance. Sounds like it maybe coming from my oil pan(sounds louder below the motor), any ideas what this could be? also I would like to know what other year of long block will work with my 88 compnents, theres alot for sale in my area. Please help I have Snofari coming soon, thank you Travis