psycho;
There's just NO WAY the 15FE is going to run at 190_F, no way. I've found that all of the Sport Engines with Humongous ports in the sleeve run hot, 15FE, TRX15, etc. Even a better cooling head does not seem to lower the temps drasticly (maybe 20_F). A better Carb helps in the performance dept, but you still have the unusually high temps.
I want to add that everything I've read about engines recommends 220_F as a minimum to allow the metals to expand properly. Anything less is supposed to cause premature wear.