Yes, if you have to ask, you've never done that kind of work. Car is down for a month?, TONS of money for the little things, engine codes, etc..
A month? That kind of upgrade, you'd be lucky to see it in 6.
Given that the Hellephants are all sold, you'd have to pay 50 grand or so for the motor and another 50 grand for all the parts to make it work. You would literally have to junk and upgrade almost every part south of the flywheel to include all the suspension, rear end, wheels/tires, transmission, etc. etc. etc.
Then, after several months of deconstruction and reconstruction, plan on a month or two of chasing codes and gremlins. So, by the time you're done, including the price of the car, you'll end up with a 1,000hp 392 VIN'd car that cost you $140,000.
I'm not being snide on the timeline, the parts required, or the price to do it all. You will literally have to remake the entire car sans the doors and mirrors. Not to mention the fact that it's illegal to put a Hellephant in anything newer than a 1974 car. Imagine spending 140 grand on a car just to have the police confiscate it. I can't.