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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 am running a Trickflow H/C/I and pushing 15lbs of boost through a Vortech. Car runs fine. It all depends on the tune and how much power you want to make. 400-475rwhp=can use stock block. Anything more look for a stronger block, like a Boss and forged internals.
With your mods and a turbo@8psi, it will make close to 500rwhp easily. I would look into getting a stronger block and FORGED internals if you want a minimum of 15psi.