Bang a tuned fireblade motor in it (i'm biased).
Tilly , i had a reverse setup like that in my first bike engined rally car and it worked well till it stuck on , managed to reverse out of a ditch after a spin and went backwards into the ditch on the other side of the track
it was embarrassing
and funny
at the same time, but up to that point it worked well, i'm using a quaife reverse box in my build