'S15 and detuned race KA probably about the same cost, between detuning the engine and finding the rest to get it running and s15 complete but will need the modifications-crossmember, electric fuel pump, wiring and etc.'
fwiw if you want to 'enjoy driving the car, and make it comfortable' s15 would save you a lot of grief. Like Jeff says, you can beat on it right out of the box, and it will return to a nice smooth fuel injected idle begging for more. No drama
Not that you asked, but my .02
Problems, ideas and comments specific to engine swaps.