stick with the sr even if u want to make big power there are plenty of big power sr’s around. besides the rb is heaveir and will throw the balance of the 240 even more off than the ka already does. and like u said its gonna be slight pain in the ass to find parts if somin like ur water pump goes. but if ur just trying to be unquie go with the rb, ohh and the swap is a little more difficult than an sr swap, just putting it out there