AoA brothers,

Well, Im considering to convert a 1987 3 door Pajero into a Petrol. Plus also want to make it auto transmission. Im no expert but some one told me that in order to do that i will have to change EVERYTHING from the axles and springs etc etc... Is that true?? What are the parts that need to be changed for such a conversion. What will be the approximate expense for such a conversion. Im planning to install 2000 cc petrol. will that be enough or too weak for the pajero? i have more questions but will ask as this thread advances. kind regards... and thanks in advance.