3 year old gas will gum up your carb and fuel filter replace it with new gas and rebuild the carb.Pull the dizzy cap off and valve covers off have someone crank it and see if oil comes up the lifters if so put everything back fire it up and pray nothing gives out.

 

Sounds like a pretty good deal,+1 on the other opinions!!If its just the battery you are getting a steal!!

 

Looks like a good deal for $3500, but check it out very throughly. Good luck!

 

dang, sounds like a good deal if it's only the battery and it's good on the rust!