its near on impossible to take the sump off in place best thing is to take the head off in position its handy enough t do and doesnt take long. then drop the whole engine and gearbox assembly together from under the car, after the usual disconnects its only the 4 cross member bolts and the gearbox mount that hold the lot in,
to get access to the conrod bolts and maybe a block stripdown for rebore there is going to be a fair bit of access required so you might aswell remove the complete engine