I wont trust buying a big bore/stroke bike unless I new the guy.I just dont trust it.I would tear it apart anyways to see whats really down there.
For builders I would choose in my order
1)Nate McCoy or McCoys Performance.
2)Kim at K&T racing
3)Jeff at F.A.S.T. Racing
4)Dan at A&S racing.
Nate Mccoy is building me a motor now.Awesome guy.Great customer service.Will help you with whatever you need.Help you tune your bike,take it apart whatever you need he will help you.I have never really talked to jeff or Dan so thats why their my 3 and 4.