It all depends on how much you're willing to spend... If the guy gives a good deal on the bike it sounds good. 3k on a bike you say is immaculate and a new or used motor for a good price is hard to beat and it is a Triumph!

If you have a budget, the guy gives you a great deal on the bike to where you can spend the extra money on shipping for a new motor I don't see why you should pass it up, TTs are great bikes! That's why I have one!
Zac