im in the middle of changing my engine in my xr3 for a standard rs turbo lump but i dont have a gearbox yet so was going to leave the 4 speed in until i get a propper box in a week or 2 but i wont bother if it's going to last a day so what do you reckon?

also how hard to put just an engine in with the box still in the engine bay or is it easyer to remove the box & fit it all in a oner??