ORIGINAL: rusty basher
Only way I see that kind of speed would be with like a 4 speed transmission. I have seen up to 80 but like you ericheller it seems pretty sketchy. Maybe a 4 speed with the ek4 .70 engine and all custom designed with special wheels, suspension and drag tests made by nascar or something like that.
actually a 4 speed tranny shouldnt help much top end, just acceloration, and ive only heard of that many gears in the old kyoshos. 120 is just unbelieveable cause 1/10 on road cars with .21's are hard to make go over 100.