hello as i am new to some of the terms used here i am wondering what full pressure or non pressure means and how you tell the difference? mine has 2 lines from the filter can that go to the block.also what is meant by babbitt bearings? i am sure to have many questions in the future as i work on this truck.thanks for now.i am still not sure weather this is a 216 or a 235? none of the casting numbers i find are in any of the charts that i can find.any foolproof way to tell?