Anyone know of a Inca 340 for sale in good condition, and know where to get
parts? Failing that, what would the collective wisdom of the wreck recommend
in this situation? Delta used to have a 10" saw, but I've never seen any
chatter on the wreck about it, and I fear that it wouldn't actually be any
better than the 8".

I've got the Delta 9", and no, I don't think it's any better than what
you're describing. I doubt the 10" is much of a step up in quality
either. Good for very little stuff, but not much else.