Have you taken a look at our engine removal DIY? There aren't measurements, but it might be useful and shows you images of the process. You can also post a comment at the bottom of it and our tech might have some input for you. Hopefully some other Pelicans chime in with some advice as well. Good luck!
Porsche 911 Engine Removal | 911 (1965-89) - 930 Turbo (1975-89) | Pelican Parts DIY Maintenance Article