The bung on the tee is for your
oil temp gauge. You'll probably have a 7 or 8 qt
oil pan, there's no way of knowing for sure without knowing the pan part number. When that plug is out of the tee there should not be any
oil coming out, the oil needs to be below that level, but high enough it hit the temp gauge probe. Jack you car up level so you can get under it, put in 7 qts oil with the plug out, then stick your welding rod in the hole and see how far below that hole it is. You would want it about 1/2 below the hole. WIth that you have your capacity, then add a quart for the filter and you'll know how much oil to use......