W123 - Engine Conversion question

[Nick Gilbert]

I have a freind who has an '83 200TE with a manual G/Box.

He wants to replace the 2ltr engine with a 2.8 six cyl unit but wants to retain the G/Box.

Questions...

1. Is this feasable?
2. If so, will the bell-housing mate-up?
3. Will the orginal G/box take the added strain?

Can anyone advise??

Thanks

Nick