they cannot rebuild an engine for that price it isnt possible so you will be buying a bodge imo, id rather buy a second hand motor that ive seen running in a car or at least with a proper build receipt like my gtr engine which sold for £3300 bare tall motor, much more than the crap on ebay but he knows it will last as its a proper pro built motor.
just think about it it doesnt take much to work it out, buying an engine from a car breaker or someone breaking there car good chance you can hear engine running and should be good for a while if come from a road going car, what engines do you think this dodgy company take in on exchange good runners ! lol they will be getting knackered engines in exchange bodging them and banging them out for naff all money, now surely that expalins my view on it in enough detail ?