Hi Lurch
Sorry it took awhile to get back to you.
We will stick with front engine for this project.
Actually it is the whole point of it.
How to build a front engine lawn mower engine powered kart car?
We have solved it.
The pair of bevel gears is the solution.
Going into a jackshaft and axle structure.Which is sort of a 'differential'.
Being you can change gear ratios.
So the 'driveshaft' from the engine to the jackshaft can be 1 to 1.
Have a nice day
Bob
These popups make for a hard post.