reason why i say it had few miles since the rebuilt was because you can still see clearly the honing marks on each cylinder and did not need a reamer for piston removal.
All of my high mileage engines (168k, 190+k, 181k) had clear cross hatching in the bores & the pistons came out perfect - materials sciences have come a long way. Probably hasn't been rebuilt before. The crank snout shearing can happen randomly as well regardless of which way the key was put in, when the key is improperly installed it usually wears and widens the keyway causing it to lose time with the cams. As opposed to shearing the snout off
Yes you can use the same tq specs for the turbo motor the engines are the same minus compression ratio and a few other small pieces here and there
Good luck with the rebuild please post more pics as you go!