Hi Shaun,
I haven't had too much experience specifically with scored bores and if they'll start after having been scored. What I will say is that if you have compression on both sides, you should be ok, even if it means you need to hone a little and possibly get an oversized piston.
How long has that engine been sitting idle? It looks horrible inside, like it's bone dry and been left to the elements. First thing, before you do anything else please lubricate the inside a little before further rotation of the internals.
Are you able to send a pic of the top of the cylinder, with the focus of the photo being closer to where the head is? Between the exhaust port and head is where you'll see the most wear, so that's where we need the focus.
Also note, if you do a compression test, wetting the cylinder with oil will change the result compared to when it's dry.
Finally, take a pic through the exhaust port so we can see the state of the rings.
Cheers,
pau13z
