OH...a "new" 5.0 DOHC modular motor. I assumed it was a newly re-man OHV 5.0. My bad for not reading carefully.
Well the new 5.0 is a modular motor. The motor mounts and transmission bolt pattern are the same.
I repeat the request for information regarding the OP's skill level. This will not be a plug and play swap. The new 5.0 has a drive by wire throttle. The intake is on the car's left side. The engine wiring harness is totally different. The requirements for engine management is totally different. There will be issues integrating an add on engine management PCM with the car's PCM.
The issues continue to grow should an attempt be made to let the new PCM control the entire car. Issues such as automatic transmission shift control. Cluster, lights, seat belt minders, air bags, ABS, fan control, and the list goes on.
Depending on the OP's skill level and goals, this project could run the all the way from "cool" to diaster.
My recommendation. Unless your skill level is very high especially in the electrical area, consider a "kit" power adder. Well designed complete kits are available from KB and other super charger makers. Some can come close to making 400 HP and may acutally have a greater chance of project sucess. The complete cost would be less than half of the number mentioned.
2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.