I think you would be nuts! $4500 if your going to start dropping money like that I would go with a tried and tested zetec turbo. Or hunt a RS motor out of Europe I was offered a low mile Cosworth 2.0 16V for about five k, and had yet to try and haggel.
Your in uncharted waters with something that I feel will overwhelm a front driver, and every other part on the tour that was simply designed for 200 hp and 167 ft/lbs.
Unless your talking about the GT
Then I say hell ya! and get the T56 too boot and eat Porsches all day long!
