don't be afraid ... it's a lot easier than the bike one's
trust me i'n bodger ...lol
no really , it is very simple and it's all on this forum ,
http://www.v8forum.co.uk/forum/viewtopic.php?t=150
you won't be able to use the rangerover bell housing for a 2wd box , there are a few boxes you can use , if you want a 5 speed the cheapest is the LT77 , that was fitted in LDV vans , triumph TR7 ( which is what i have in mine) the rover SD1 loads of them ( that what i'm building , the gearbox) the gear ratios tend to vary a bit , but it's only the 5th gear that varies and they fitted a larger diameter output shaft to the later ones ( which is a right pain in the a**e as the bearings are rocking horse s**t
you try finding a 27.5 ID x 55.00 OD roller bearing , and for the sake of 2.5mm ( early ones are 25.0 ID X 55 OD )
and if you don't want to thrash the life out of it , it will do you nicely and not TOO Much money , the bell housing tends to be the expensive bit
or you could go for the later and stronger ( some say ) R380 ,m and there are some more , tend to be used for those who race them
i have probably forgotten something ....
but if you have all the bits for the EFI ( airflow meter / ECU ( large silver box ) and resistor pack ( smaller silver box))
keep it , it's very simple to setup and needs no lambada sensors or any other fancy bits