Here is a 15 page document dedicated to educating you on how to align and properly install your N52/54/55 engine into your E30 or E36. This has dimensions, technique, details, part numbers, and all you’ll need to know to install your driveline.
This is a free download, just for you, PDF Format to view and enjoy. So read through it, understand what you may need to know. If you would like to take a bigger bite, feel free to buy the entire guide for either the E30 or the E36 chassis. Good luck and happy reading!!