There have been a number of threads on the subject of
oil coolers. In my opinion, the most important thing is to run a thermostat in the line to prevent the
oil from running too cool. Mocal makes a nice sandwich style adapter that fits between the filter and the block, is 1" thick, has 1/2" NPT female fittings and works very well. You really don't need an
oil cooler for the street but they just look cool and more original. FinishLine also offers an aluminum shroud that finishes off the installation but they are relatively easy to make if you are handy.
By the way, Clois, how do you tell which port on the oil cooler is "IN" and which one is "OUT"? I never thought it made any difference.