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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
i dont recommend you to use the stock 4 banger suspension witha V8. Also the rear should be changed too bc the 4 banger has a 7.5 rear end and the V8 has a 8.8
The 4cyl suspension should be fine with a V8. Many drag racers change to the 4 banger springs so they launch harder. They are softer so you wont have a great handling car but its not dangerous. Like stanglx said the 7.5 is pretty weak but i bet it would last for a few months if you are not too hard on it. Dont drop the clutch at every stop light and for sure dont drag race with slicks of any kind.