when we swaped then engine and box from my old chassis to new one we used a 500kg chain hoist because thats what we had lting around its fair to say it wasnt happy!
it whent up ok but locked solid at the top hovering over a brand new chassis i wasnt feeling very comfitable but got it going with a big screw driver.
i think a 1 tone would be plenty but get the biggest you can aford its never a bad thing to be over spect when lifting hevy things.