First, nice build! I like those little cars too, even if I don't know much about them. I'll have to build one.
Second, people tend to exagerate on HP numbers. I have seen some people, a '68 Camaro owner for example, who claimed he had 550hp, well turns out he saw the tail lights of my 2.2 turbo Daytona Shelby that has 235hp. Now I know my Daytona is lighter than the Camaro, but still, there's no way he had 550hp in his Camaro. Plus, most people take dyno numbers for cash. You can get different numbers from different dynos with the same car and setup. A dyno is a tool to tune an engine/car. In my book, if you want real numbers, weight your car with you in it, then go to the dragstrip, do a few runs, then use your average MPH and vehicule weight to calculate your HP, using a Moroso ruler, or horsepower calculator. This is, in my opinion, the best way to know the real HP numbers. Do not use the ET in the calculator, ET's vary too much. ET tells how good or bad your car hooks, or how good or bad a driver you are, trap speed tells the HP.