Update - final finished rebuilding motor. Had 2 blown Conrod bearings as previous owner didnt change oil. fitted new sleeves, pistons, rings, crank and bearings. Had heads done while they were off also. Also new oil pump. Now finished putting it back together and time to drop it back in.
Nice work! I replaced my engine in my 2011 RRS without removal of the diff or the grill. It's possible and you can do it without any damage to the firewall covering etc. I decided to just replace the engine instead of rebuilding mine since it had been overheated.