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the problem with RB series engines is that they are far more expensive and parts are harder to find than just about anything you can put into a 240sx. RB swaps are for people with money that just want to say that they have a skyline engine.
The 2jz-gte (NON vvti) wins hands down every single time for the most inexpensive reliable swap that is capable of 500 horsepower with OEM internals on a daily driver 25mpg basis. Nothing else comes close except the LSx series engines, which are a bit more expensive, and they lack the turbocharger aspect, but they are just as fun if not more fun to drive.
the sr20 is the cheapest most reliable option for about 300 horsepower daily driver aspect, and it will give 28+ mpg in the 240sx chassis. its also the quickest to install, around 3-6 hours for a complete swap (old engine out, new engine in) if you know what you are doing and have all the parts ready.
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