The single port motor has a lot of potential with forced induction, but shine1stang is right. The high power v6 guys are usually running split port engines.
I'd recommend a split port swap. It's supposedly silly easy to do so, and 99-04 split ports are plentiful and dirt cheap. While you're at it, it's best to find a 4.2 engine from a truck/van, as it's basically the same engine and swaps out just as easily. For all of the H/C/I work you'd be doing on the single port, might as well put the small extra effort and do the swap.
2002 Mineral grey GT 5 speed. Flowmaster 40's catback, Mach 1 grille delete, timing advance, push button starter, Bullitt pedals, FR500 steering wheel, K&N FIPK, Self ported upper intake w/ spacer, Pioneer Avic D3, MGW shifter, MM FL subframe connectors, Mach 1 springs, Bilstein HD struts/springs