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Your leak from the front can be timing caover oil seal or front plate gasket. Check the post on "Main front Seal" below, I have posted pictures that will give you an idea of what you are taking on. It's no big deal but you will need a good jack and plenty of blocks of wood. The same goes for splitting the tractor. I have done this hundreds of times so find it easy. We had a pair of wheels mounted on threaded rods and fixed in a frame, but not on rails. This went under the back of the sump and had two steady bars up to the front plate mounting bolts. this allowed us to push the engine and front axle away from the gearbox and move it anywhere in the workshop. I have also done the job using a tractor and loader, pallet forks and blocks and engine hoists, but I would never recommend using a trolley jack as these are too narrow and it is possible to drop the engine. The bell housing oil leak can also be from the gearbox input shaft oil seal. Not a big job once you get the tractor split. The tar like deposits in the engine are possibly best left until you carry out a major overhaul. Any attempt to clean them without dismantleing the engine can result in a clogged intake filter on the oil pump and starving the engine of oil. I would use normal diesel engine oil, work the tractor and change the oil and filters after short intervals. This will soften the deposits slowly and clean them out in suspension in the oil. Be careful and plan your splitting jobs carefully to avoid any accidents and injury to yourself.
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