Take the ZL1, add 5k+ for the motor, another 5k+ for the brakes, another 3k+ for the seats...
I'll be AMAZED if it comes in less than 10 grand over the ZL1 MSRP
I'm not gonna argue why a less powerful motor would cost more, why it can be expensive to leave things out of a car, etc..... the COPO doesn't even have carpet, heater or a single speaker!