As a rule of thumb, unless the tires are obviously new, I swap on new rubber anytime I buy a used bike... you never know how they were treated. Personally, I like the Gulf paint... the GT40 is one of my favorite cars evarrr; I'd have to rearrange the stickers, and get rid of the non essential ones... but I like it. Keep the swingarm and spend the money on other stuffs, and unless the current exhaust just sounds like a can of rocks, I'd keep it, too.
2013 M796 ABS in Artic White
1993 XR650L (the Torque-a-Saurus)