Havent seen any threads on an LSJ/B20 into an L61 car. Wonthering what it would take aside from the obvious harness, LSJ sensors (if using a B20), and PCM

 

It's alottttt of work trust me. I swapped 06 to 07 l61 in my car. It requires either full body and engine harness. Or doing what I did which is buying the ECM bcm engine harness and hardwire about 150 wires. Personally I would just build your l61. You'll make more power in the long run with the l61. There's no replacement for displacement as they say.