Do those things listed above before you waste your time changing a headgasket that isn't needed. In all my years of working on Honda's I've come across very few headgaskets on non-boosted cars that really need to be changed because they are blown, pretty much only on cars that have overheated due to a blown hose or something like that.
+1 the people i bought my coupe from in TX must have loved seeing the car overheat
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if you can only race me in a straight line then whats the point 
...91 SMF SCCA
http://www.flickr.com/photos/8341770@N07/5601083432/http://www.flickr.com/photos/8341770@N07/5601083432/ by http://www.flickr.com/people/8341770@N07/, on Flickr
I see people out there spending money on the car to improve it … If you spend half that effort just working on your driving skills, making you and the car work together as a team, then you’ll go faster – period. To make the car go a second faster on the track takes a lot more energy and money than making yourself drive it one second faster.
– the late Tom Thrash SCCA Solo E Production