[Planning to convert the Puma 2.4]

Hello gents 

Gents 

please need your experience 

I have a 2010 defender130 with puma 2.4 engine and 6 gears gearbox 

I want to convert this engine by V8 petrol engine, 

do you have any idea what engine that can fit to 6 gears gearbox or at least with can be fit with easy modifications 

also if you can suggest me an engine and manual gearbox and transfer cease can fit easy on defender 2010

best regards