Hi!
I am kinda new to UE5 and in need of help 
I’m working on a project with a very limited amount of time to finish it, and within the project I need to create a city scene. I decided to use UE5 for purposes of this project for its faster rendering process.
I have a 3D model of the city map as a simple blockout generated and downloaded as .stl from “City Generator by ProbableTrain”. I imported the .stl files into Blender, edited them so they are properly aligned and exported them as .fbx file. This, I imported to UE5.
The map is probably too big (and I can edit it eventually) but once loaded, it looks fine in the engine. There’s a lot of buildings which I separated into individual objects in Blender and they are all under the imported FBX scene in UE5. I would like to use this blockout 3D map as a reference to create my city (buildings, streets, roads, etc.).
I was trying to find out a simple (or not so simple but funcional and clear) way without coding or using any other additional software like Houdiny to replace the blockouts with assets of my choice. Specifically, the Kitbash 3D assets.
I tried replacing actors with selected but it either didn’t work, the new actor spawned elswhere than the original, or the new actor appeared in the somehow right place but its location/rotation was still off.
I also tried to change the mesh in the object properties from the blockout to the one I wanted to use. It replaced it, as well as all the textures, but in the viewport, the actual model didn’t change.
So, my question is, is there a way to replace the blockout buildings (and possibly roads) with other assets without the need to manually adjust each one of them and have the final models in the exact same position as the blockout ones?
I was trying to find any tutorial which would show how to replace blockout with the final models (and keep the translation of the original without the need of individually copying it and past it to the new model), but found non that would show the process, all I found was just about the blocking process itself. So, I decided to try and ask here, hoping anyone would have any suggestions (if what I need is even possible).
Also, I am including pictures of the 3D city model in Blender and in UE5.
I appreciate any valuable comments. Thank you!