I'm not all that concerned with the over/under 35MPH factor you describe. It does though, run fine on the freeway. Around town I thought it was ok, but she got hot, but not boiling hot. I'm more concerned with the initial start up temp at this time. I'll fix one problem at a time. I'm not running a hood right know, to much pretty stuff (bling, as they say) to oogle over! I talked with a rodder buddy of mine this evening, he suggested not running a thermostsat, instead run a calibrated hole in place of the thermostat. Don't think that's a good idea. He did get me thinking, I'm going to try drilling two 1/8" holes in the themostat flange to pull some coolant towards the thermostat, that may even out the intial temp problem. If that works, I will do some more test at slow speeds, to see if the engine will get to warm for my liking. If so, I will fab up a fan shroud. I've never needed one before, maybe this engine is slightly to pumped not to? A little technical info, 93' Rodeck 350+ Block "O" Ringed W/Copper Head Gaskets, Brodix Track 1 Heads Pocket Ported, Scat Crank & Rods, JE Pistons, Crane 538/558 Hyd Roller Cam, B&M Powercharger 250 Blower @ 10PSI Boost, Cooling is a Walker Cobra Z Series Radiator for big blocks and blown motors, and I'm running a Vintage Air 14" Curved Blade Electric Fan @ 2500CFM.