450 is around max for power on stock internals.
but because you are spraying it aka not going ot be pushing it all the time then you would most likly be fine. but if you can afford them i would do it. so basicly if you can afford to dot them do them if not then get a safe tune and should be good. but those fordged internals will take more abuse should you get bad gas etc....
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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