I've never tried a Cusco 35/65 but I reckon it's too much rear. I drove a R32 GT-R once that had lots of power ~ 450 horse, it wasn't fast on the skid pan as there wasn't enough going to the fronts and too much to the rears. I felt unbalanced, nervous and less fun than a 200 horse Subaru after you get tired of smoking them as you spin it backwards. I'm thinking 300 horse and 65% rear drive in a GC8 you better have sticky tyres and 2+ cans of Red Bull before you get behind the wheel.