im having the same problem with my stroked 340. granted its warm out but it runs at 190 while cruzing, and easily goes up to 210 when stopped at a light. i didnt put a thermostat in it tho. thats the first thing im gonna try. im a little worried that the thermostat might restrict too much tho. so if it still runs hot with it, i think i will leave it in there but take the middle out of it. please keep us posted if u fix the problem and what u did. i will do the same!

p.s. i am running an electric fan with no thermostat on it (direct to the key) and a 3 pass rad