MMMM GNX, I do love the Cyclone too, nothing like a factory turbo pickup that will run 12's stock. SR's a good motor, RB's are good motors, best reccomendation is to jump on a 240sx messageboard and search, you'll just start alot of trouble asking this sort of question on this forum. If you have the money go RB26, or SR20 if you want to drift, or rb25 if you can't afford the 26, or RB20 if you're on a budget and want a swap with 190hp stock. Or build your KA and boost it, we're building 2 now shooting for 800+.

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