Welcome aboard! I hope zilvia will be your place to hang out
Props on the evo!
Working on a 240 is much2 easier.. you shouldnt run into any problems.
What will you use the car for? street only? autoX? Drag?
If you're into crazy high HP, I agree with the posts above.. go hybrid.. RB25 or RB26...
But you can just turbo the KA and see if you can make more than 600HP (cuz nobody has done that before).
Im pretty sure after hanging out a while in 240 community, you'll have a made up decision on which motor you want to go.
Have fun and Good luck with the new project!