3 mains but fully forged that with balancing and
work will rev over 10,000rpm without sweat thanks to its
Rod stroke ratio around 2.017 to 1 (A12 around 1.73)

Supposedly the A10 has
better distributor
better carburettor
fuel economy obviously even revving its tits out on the freeway.
flat top pistons like a a12gx (however dished pistons and same comp is better)
It really is an efficient economy engine.

I would prefer an A12 bored out to 76mm for fun since
the K wont be a daily when you have a fleet car to abuse :)