I run basically the same (CAR) body as you. I ran mine through a hole, I cut, under the steering shaft. There is a circled flat patch (If you know what I mean) and I used a rubber grommet..
If you are using a smaller cable, 8 gauge, the clutch cable hole will do..
Power by Herrod 185rwkw
Power by me 313.6rwkw
Stereo by ///Alpine