You're way over doing it!
These cars are really light, especially compared to the cars you just listed. Look up the curb weights. You can put all the power you want in a Z but it becomes really difficult to get it to hook up. Also the chassis is not designed for that kind of power. It takes big money to make that power and it takes big money to upgrade everything else that it demands, chassis, brakes, tranny, rear end, half shafts, drive shafts, etc. If you have 30 or 40k burning a hole in your pocket then ok...