thanks for the tips on the oil. i've already done new oil all around. it was low on the clutch when i got it home.
the issue on the tank is not one of cleaning up or sealing. the threaded insert stripped at some point. somewhere along the way a previous owner tried to fix things with JB weld and some countersunk nuts. i'll have to get some pics to explain it better. my thought was to get an aluminum brit tank of some sort and strap mount it to the frame.
the air filter is a uni and is clean and oiled. i knew the mikuni wasn't stock, that's why i wanted to mention it.
also, this isn't going to be a restoration. my goal is to get it running well without spending 4k on a 2k bike.