Corte Loco

I have a 1986 930 3.3 lt for race and I need som help on best set of gears for the track. I have a set of stock gears and final ratio of 8:41 with Quaife LSD. The car wheigt is 2480 lbs. The main lane has 650 meters, the second 400 and the last 300. The curves are not a problem, all are in 3rd gear. The car has 450HP aprox. What do you recomend?

Regards