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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.
run the 302 headers like said it is the deck height that make the difference not the heads in this case.
you cannot run 302 headers on a 351w because:
1. The headers will sit higher up and probably will not clear the floor pan
2. The headers will sit wider at the flanged and your mid pipe will not line up.
You cannot run 351w headers on a 302 because:
1. The headers are taller and will hang out under the car. They will likely drag on a stock ride height
2. the headers will sit too close at the flange and you will not be able to bolt up your mid pipe.