WLRC Gearing advice???

[Mike145]

I know gearing can be one of those closely guarded secrets of the trade but its causing me something of a headache. I'm going to be racing a tc5 (don't laugh, got it for a good price and thought it would be a start) at wlrc this season. It's come with a 25t pinion on a 83t spur. Which according to the manual will give somewhere around 6.7 final drive ratio. Would that be ok for wlrc because I'm obviously going to have to buy extra gears if not. Any advice would be great, cheers.