which gearbox?????

Hi Guys, i'm fairly new to this site so thought i'd say hello and let you all know what i'm up to.... (i look forward to receiving feedback/knowledge)
i'm building a defender 90 using my 300tdi disco as a donor! the axles from the disco will be going on the defender as will the engine but i'm a little unsure of which gearbox and transfer box to use, the defender will be used for off-roading/lanes and also for towing, i've already bought a defender transfer box as i believe this would be a better option for what i'll be using it for, an lt77 box i know will go straight in but i've been told a r380 defender box (not disco) will involve a bulk head and tunnel masacre....!
can anyone help me pleeeeeease
cheers boys & girls

300tdi defender uses same gearbox as disco except gear change assembly, tunnel,bulkhead diaphragm and seatbox front need changing to 300tdi spec if fitting a 300 as lr did ,but front prop from disco would then fit the def and most other pipes hoses with engine etc

As I have no shame



I'm selling the adaptor kit to swap the R380 from disco lever position to defender



http://www.landyzone.co.uk/lz/f62/r380-discovery-defender-conversions-parts-239137.html