Weigh both engines with all associated components and document weight changes, I'm interested in seeing how they stack up in comparison.
In fact, you should document everything as well as possible, pics, videos, measurements, before and after pics, etc.
Might as well graft the newer suspension on while you're at it 
Also, it's not worth it if you don't get an electric starter in the process!
Think about it, a zilla with a charging system and magic button...