cbmoor a few comments, in your initial pics let me say WOW ! fantastic looking restoration !
my second comment in looking at your chain it looks like you have ZERO chain slack ? This is a BAD practice and as the swingarm moves upwards through it's arc stroke the chain will tighten. You could very easily granade your rear hub, i've seen this happen first hand (especially in a moist sand race )
IMO it's always better to have a little extra chain slack, than a chain that's too tight.