Pretty much contradicts everything about the swap…
If you’re anal about weight. Why are you willing to add 200lbs, or more, to your car? That’ with the all aluminum versions…
Why not go with a VQ? This would literally be the best option for you. Same weight as a KA. More NA power. The front of the motor is further back. Since its a shorter motor.
With either VQ or LSx, wiring is gonna be a bitch.
It would also be a bit cheaper…
Your logic confuses me…