First you need to see which accessory brackets and engine harness are going to work for the z34 Monte Carlo ,as that is an older car that never had the L67 offered.
I would do some more research on the swap to find out what will work with your car. Such as which harness to use to simplify modding it to your car and other things as well.
Also you can use any L67 engine and swap the necessary brackets to fit the swap in your car.