Yea, they both def bolt right in there. I have awesome electrical diagrams for the body plugs that make it really easy. Unsure of 2jz wiring, but I know there are pinouts and diagrams out there. The 2jz is a bit of a squeeze with the stock twins, but it will fit. But 2jz with single, not an issue… 
You really don’t have to lengthen the harness on the 1jz, which is what the PITA is. Just extend the body plugs slightly and go through the driver side with a grommet and snake the harness through the dash to the glove box (future goal to hide wires).