Hello Tom
Here in Chile we are doing a similar project like you but with other motor. We started with a TGB1314 ambulance, changed the motor, extended the chassis beteewn the axles in 950mm, and also after original rear bump.
I want ask you if you know who sway bar from some truck could be used to add in the front.
we installed TD42T nissan with gear and transfers case nissan PATROL/SAFARI 24V, changed the R&P to 5.99:1 how we work sometimes in the weekend in this project we are take a lot of years more or less 4 years that from started to work.
I asked for the sway bar because I need improve the front, seem I have too much weight in front, I will do a reinforcement of front leafs plus add the sway bar
I really would like to get some information about sway bar possible to be install
Regards
Tamarugo