GT40 irons, the Cobra intake you have, stock cam, S trim supercharger IMO. 400-450 to the wheels easy.
If you don't want to do that then your best bet is to get your lower inake ported by tmoss (top needs nothing), a TFS1 cam and a set of 170cc Twisted Wedge heads for 300-325 NA.
You will need a dyno tune either way so that's a wash. Also a good idea to upgrade the T-5 with either option too, they like to explode even at stock power levels.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.