1971 Valiant Super Bee (Mexico) Proyect

Neat cars,love the striping and the unique side mirrors.

I have a couple questions,do the speedometer come in kilometers? In the picture showing the rallye dash on the car being restored,it looks like the speedo has much larger (numerically) numbers than the domestic version.

Also,what are the differences in the motors beetween the Mexican and US/Canada 318s? If the badge says they're rated at 270 hp as opposed to 230 for ours what's making the extra hp? 4 barrel carb? dual exhaust? cam? 360 heads?