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A straight-6 is the best option, though a V-8 can be quite alluring. I know several RB25s have made their way into 240Zs, 260Zs, and 280Zs over the years, and they are excellent power plants and apparently a fairly easy install. Of course, then you have to ask about hard-to-find JDM replacement parts and such (my friend has an RB20DET in his 240SX and gripes all day about that problem). You could even go even rarer and put in a diesel; I know the Nissan RD-series (RB but diesel) is quite potent, as is the LD-series (L-series diesel). Those L-series themselves can crank out quite the horsepower and torque; you might just want to leave in the factory engine and work on it. Turbos are everyone's favourite accessory.
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