A large number of people replace their engines with four-wheel drive. This isn't the most cost-effective option, but if you have a vehicle that has a value that is greater than it would cost replacing it, installing the new engine is an option that is very sensible.
Many people hire auto electrics in Perth to replace the engine to increase the power, even if the engine they have is operating well, whereas others may change the engine once the previous one fails. A majority of people choose the latest engine and the same engine allows for easy fitting.
There are plenty of adaptor kits that adapt different engines to the same space, but you're better to go with things that several people have already done; they are familiar with the issues and can help you through. Do not try to install an enormous engine into the engine bay of a smaller engine because it will make the process incredibly complicated.
The wiring is typically the most difficult aspect of converting an engine, and you would need to shell out many thousand dollars to get the entire conversion completed. The first thing to think about when considering installing a new engine is the legalities involved in performing it.
It is likely that you will have to run it through the pits over again or be designed to prove that the work was carried out in a safe manner and is legal. If you do not take this step it could invalidate the insurance coverage of your vehicle because it has not been licensed correctly and is thus illegal.