Make sure you get your engine built at a shop with a good reputation. I've known several people who have had shops build motors for them and they would break fast or just wouldn't work right in the first place. I guess they would take them to shops that don't have as good a reputation as others because they were cheaper, but I don't really know, but they almost always tell me that they had a hard time getting the shops to take any responsibilty for what went wrong with their motors. Most the stories I've heard, the people say that they weren't able to get the shops to fix their motors or pay them back the money for the parts, or the money they paid them to build their motor. A shop with a good reputation should do you right though.