Buy a 408 stroker from Fordstrokers that'll make more power, weigh less, have better parts and you get to customize it. Also will cost less.
Remember that 575hp figure is on an engine dyno. A mild 408 will make 500-550RWHP without breaking a sweat. Get a little more radical and 600+whp is not very hard.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.