That's awesome! I used to work with sprint cars. Love the smell of methanol and dirt in the face.
Wingless should be a lot of fun in a car that light. Squirrely little suckers. You may be down on power, but on a 1/5 track I doubt that will have a huge impact. With no front or back stretch to really wring it out on, build it with a tight power band, gear it right and just sit on it. It's going to be all about the corner and the cushion on a track like that. Find a good line, hit and stick it. And you should be able to keep up with the pack.
Should be a lot of fun! Hope you find some sponsors and get to race at more tracks and in more series.