The old Fuji chile pepper, I'm not a tuner but I'll give suggestions. There are dozens of engine swaps that are great for this race but I'm giving a very simple choice. Any of the Group B rally cars, they only need three things. 1, Racing softs, grip is crucial at Fuji. 2, Custom manual transmission for taller gearing and PP reduction. 3, Turbo, I prefer medium RPM for Fuji but your choice. Tuning is simple, set tallest gear to 340 kph, lower the ride height to 15 above lowest, everything else stock.