I have a 62 Fairlane w/ a 170. It stays cool for the most part but these ninety plus days in stop and go is killing it. I haven't put a thermometer to see what she's actually getting up to. But the gauge is definitely high. What's the ideal temp the engine can run at? What don't I want to go past? I only have a four blade fan, would a five blade make much of a difference? Also I was going to look into some water wetter or purple ice. Was there a shroud on these years?Not sure if these years run the sane size radiator as a mustang/falcon.