I have never experienced a jz engine...but I would love to get the chance too. And i know how hard my 7mgte engine pulls so if you say the jz is faster im just so curious
Either way it would def be a challenge.
I took some measurements earlier, and it will fit, it will be EXTREMELY TIGHT though.
The less I would have to do with the ecu swap would make me happier. Running the main harness and setting up the ecu will be the hardest thing to do. Besides getting the motor mounts welded on.