How to reinstall the engine to a frame that’s been powder coated

The frames been coated matte black, how do I install the engine back without scratching the frame? via /r/CafeRacers https://www.reddit.com/r/CafeRacers/comments/dtq58v/how_to_reinstall_the_engine_to_a_frame_thats_been/?utm_source=ifttt