The snout of the torque converter fits in the back of the crankshaft. No bushings, no bearings. If there is a pilot bearing in the crankshaft it will need to be removed.
Sounds like this is a new engine (?) If so, nothing needs to be done. No extra parts needed.
A pilot bearing is needed in a manual transmission because the input shaft of the transmission will spin at a different speed from the crankshaft when the clutch is not engaged. The pilot bearing allows the different speeds and supports the front of the input shaft keeping it aligned.
The snout fits in the end of the crankshaft to keep it aligned and supported as well. Since the convertor doesn't spin at a different speed from the crankshaft, no bearing needed. Just a loose slip fit so the convertor can move in and out a tiny bit as the convertor is installed and the flexplate flexes.