Engine Question.

I've been looking through engine choices for a 89' - 94' Nissan 240SX. I'm getting ready to do a Sileighty conversion and was wondering, what would better and/or fit, a SR20DET, a VG30DETT(would it fit?), CA18DET, RB20DET, or any suggestions on a better engine that would fit?

*MORE INFO*

Also to give some more info, the car will be used for mainly street/drag racing and some drifting. Also I did a little more home work for the engine. SR20DET, VG20DETT, CA18DET, KA24DET, RB20DET, RB25DET, and RB26DETT. What do yall think would be that best for my application, and what would fit and what wouldn't. I'm looking for the most horse power I can get from any RWD Nissan engine that will fit in a 89-94 240SX without too much modification.

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