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ill guess using things ive read and seen. a stock 4.6 has about 235 hp. while the 32 valve cobra 4.6 has about 265 hp. with a supercharger ( depending on the pully size ), you will get a 40 to 50 % increase, so id say close to 400 ponies!
The mod motor isn't my favorite, weight and size of a big block, along with the wonderful Ford reputation in combination with dated smogger small block power. Not a winning combination.
Too much of a mess. There are many other power adders to choose.
On this forum are individuals using 144/10-71/6-71/8-71 blowers, centrifical superchargers, turbos, nitrous, etc. So there are many paths to choose from.