http://afterdarktuning.com/inf...#faq1 For the info on how he gets the motors.
And as for what is warrantied this is copied directly from his page
Startup GuaranteeEngines are guaranteed for startup. All engines are sold in 100% running condition and all primary engine components are covered. The block, turbo setup, fuel system, electrical system/harness/ecu, and intercooler are covered. Peripherals (ie:the radiator and AC system) which are not guaranteed to be with the engine, when included are not guaranteed. Additionally, the clutch is not guaranteed. If for some reason something is damaged or inoperable please see the following warranty procedure. Damage that results due to improper installation or handling is not covered by our startup guarantee. Damage due to modification is not covered by our startup guarantee. Our startup guarantee warranties that all parts are in working order when they are shipped to you, we are sorry but we cannot provide a full warranty for out of house installations/procedures.
Plus you know he will take care of it and won't screw you. Personally I bought my swap from him. I don't think you can find a better quality unit with great cust. service at such a good price.