Absolutely get the heads/valves done!
You should go to the Kohler website and download a free service manual.
I always use a brush type hone to deglaze/condition the bore. But you also need to check for excessive wear.
If you've done v-8s etc, then you know what ya gotta do.
Get the service manual.
" But let me tell you something ,folks: You can't fix stupid! There's not a pill you can take, there's not a class you can go to. Stupid is forever!"