Hey there 1200GX,
all advice offered so far is very good and aims to get the best from what you have now. It is not always the HP figures that will impress - because the truth of it is that big HP from a little n/a engine may cost big $$ and/or much effort. I went to a dyno day with my coupe and belted out 89 rwhp , the turbo falcon following me put out around 240 rwkw The best part was that people watching the runs enjoyed the sight and sound of the little A series @ 7500 rpm, while the falcon made no noise, no excitement and got an "oh yeah, that's good"
In summary, enjoy the experience and use the data as a base for future improvements - the fact that your 28 year old car is there is a victory over the others anyway!!
Cheers