1) I wouldn't run it without a battery, spend the $20 and get a new battery! Better than $50 when you blow you headlight!!
2)I would remove the carb for a good cleaning!
3)replace the air filter, it was foam back in 77! now it is dust and oil!
4)I wouldn't blindly trust the oil injector! (it is probably fine but if nothing else make sure it smokes when you start it!!)
5)clean you fuel valve!!
6)check for spark: dress and set points!
7)www.bikebandit.com has parts for your bike!!
FYI: I usually do everything as much as I can before placing a parts order!(so I dont end up paying shipping twice)