Everything looks ok - the fuel filter near the carby is an addition, and not a bad idea but I'd put it on the other side of the engine away from the exhaust manifold myself. The carby has some staining, but is probably fine - tighten everything up and I find it runs fine, just leave it IMO.
Again, with the oil leaks, tighten everything up, degrease and get the RWC - for the time and effort you'll go to trying to stop them, it's probably not worth it unless you want something concourse. Maybe the rear main if it's ****ing out but that's more to save the clutch than anything else.
Can't work out what that disk is... Need JD to poke his nose in, I'm sure if it was a factory item, he'll know.
When's it going in for the RWC? :)

