haven't reread the thread, but you need to be aware that the 16 valve trans does not have an overdrive 5th. It's nearly the same ratio as your auto box's 4th. A non 16vlv manual trans will have its 4th same as the auto box 4th (around 1:1 ratio). Its 5th is around .78:1 ratio giving it rather long legs. Also, research the use of gasser flywheel on the diesel.

EDIT: add manual trans cross-member for your chassis. Also the wood shifter surround is different.

__________________
Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon