Front cab body mounts did not align. I had to swap the left and right sides and that worked, rear cab mounts were good. Core support mounts were cut off and replaced with 2nd gen mounts. Bed mounts were about 1 1/2" off. Fixed that with angle cutting square tubing spacers. Over all body was raised about 1 1/2" for air cleaner clearance. Frame was not shortened.
Yes 4.3 has been solid. Fuel plumbing was fun. As 4.3 came from a T10(4wd S10) oil pan and pick up had to changed. I used NWOR motor mounts, they either fit the engine or the frame but not both at the same time. That was a PITA. Radiator was from a first gen Toyota diesel initially, when that crapped out went with a Toy V6 rad.