Are the 2.2l's lifters hydraulic? If so, I'm not sure anything can be done short of replacing 'em.
If they're solid, it shouldn't be too horribly hard to adjust the valves yourself...
And the overheating definitely sounds like a bad fan clutch (I'm assuming the "main" fan's belt driven). You might want to try and turn the engine fan with the engine off...it should turn with some resistance; if it freewheels very easily, the clutch's definitely bad. Also, does the electric fan turn on when it's supposed to?