Ran a few more tests today - all at idle in neutral. Used an infrared thermometer and verified the temp gauge. Temp was measured right next to the temp gauge sender in the intake manifold and the #'s were within about 5 degrees. I'm calling that accurate. Without a stat, temp seems to level off at about 195*. Installed a 180 stat and the temp came up to 180 quicker, but seemed to level off a little higher than without a stat at around 200*. I'm thinking that it is due to the flow restriction caused by the stat? Anyway, the temp went right on by the 180 stat. After the temp leveled off at around 200, I kicked on the A/C. This added about 10 - 15 degrees and the temp leveled off at about 215. Ambient temp in the garage was in the upper 70's. Sooo, it appears that my existing system will hold the engine temp (@ idle rpm with no load )at around 190 - 215*. I think my next move is to install a separate trans cooler.