The part you refer to to is the carb flange, it will easily unbolt.
For the turbo, start by removing the oil pressure line hookup. Drip some engine oil into that port to lube the bearings and shaft. While the front of turbo is opened up, spin the shaft/ Impellor. Does it spin smoothly? How much wobble does it have? Look at the impellor and exhaust wheels for damage on the fins. I would not recomend taking the shaft apart to check the seals. If there is excessive oil comsumption once it is running, then do the seals.
