Great dream, and I'm sure its one shared by many others. If you've got the opportunity to do it then go for it.
Can't help specifically with your question, but will offer a slightly alternative suggestion (albeit I'm a bit biased)...
What about picking up one of the ex-army Isuzu powered landies.
You'd no longer have to worry about anything engine wise, probably nearly as agricultural as your series III and you'd leave yours in its virgin state.
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
Bookmarks