8 pages, no more!
Put the team name and car number on the head of the first page.
Remember, when arranging the layout, that the page sizes differ between the US (letter size) and Euro events (A4 page size).
You should have no trouble filling the report with stuff the judges want to read. Most likely you will have to cut some stuff out!
We judges aren't getting any younger, so a nice open font is nice. Try Arial in 11 point.