Almost any of the base supercharger kits (which are meant to be relatively safe for a stock shortblock) will make the kinds of numbers you are talking about on a 99+ 4.6L 2V. I was planning on a Vortech V2-SQ, but I have recently decided to go with the new Kenne Belle twin screw blower. The same blower can make 6-14 psi with only a pulley change, so you could run it at up 9psi intercooled on a stock shortblock and then bump it up later if you get a built shortblock.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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