A Renesis has been swapped into a first gen RX-7 years ago.
You need the entire wiring harness, engine, trans, custom driveshaft. You need to make sure the 240Z clutch master cylinder can be adapted, or use a custom set up. You also need a full set of custom gauges along with a speedometer solution.
Keep in mind that you will also need to sort out an oil cooler (a second gen would work well).
These are all basic things, and apply to almost any cross-breed engine swap. Custom engine and trans mounts. Custom exhaust set up, and intake.
And it takes money
