You can get 500 on a stock block, many will say you cant, but it can be done, with a really good tune. Look into some 42# injectors and a blow through MAF, or some kind of tuning to work with the charger, good luck.
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Ryan
1990 Mustang GT (In Process)
1993 LX Coupe (Daily Driver, but just choose not to)
2005 Excursion (Big Pig)