I donīt know why people keep thinking single cams wont make power. As a matter of fact single cams make great power and 400hp is not far fetched especially with the rite turbo.
I know a single cam with rods pistons mild head work with a cam and a gt35r thats make a little over 400 whp your biggest problems will be the tranny trying to hold up thats about it. Always remember to use quality parts to reach your goal and get a good tuner for it personally i would go with John Vega. just my 2 cents