Bloody hell mate if you think someone's gonna do a complete engine conversion for less than £300 you'll be waiting a while, unless you've got a mate to do it for beer tokens lol! How many garages do you know that only charge £150 a day?! Tbh for £300 i can't imagine it'll come back all setup and running sweet ready to go, to do a nice job is gonna take more than a day for sure.