As previously mentioned an engine tear down at this point would be in you're best interest because of the lack of mechanical history. I just started the same evaluation with one that I bought this past summer and the biggest thing is doing the slingers hence the tear down. Having said that you might as well go through the engine and trans to make sure you have they are mechanically healthy to insure you'll have years of mostly trouble free riding. Budget about 2500. more or less for the engine rebuild and since the trans is less complicated than the later airheads your budget should be 600-700 for a rebuild depending where you take it. My recommendation would be to talk "Vech" at Bench Mark Works for further advice 662-465-6444.