280 on stock internals. you could probably do 325 with pistons, rods, E85 and a sprinkle of boost in the 7-12 Psi range
I want to do this route to keep my factory 4WD system and 5 speed, if you have a 2WD a 5.0 Swap would be a much better option. Mustang 5 speed and gap the rings according to...