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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.
personally I would get the ones with the adjustable spring perch and urethane bushings on the body side. They will work well for what you want. Then if you need to adjust your suspension for anything in the rear you can.
If you are hurting on money and want something better than stock you can at least go with latemodel's version of the MM's
So should I get the non adjustable one also I plan on making about 500-600 to the wheels so should I be fine with heavy duty or should I get extreme duty
Its so you can accurately set the Instant Center, and Anti-Squat dimensions of the rear suspension geometry
It is even close. I'll bet 90% of the buyers of adjustable spring perched arms are doing it to raise or lower the ride height of the car.
To the original poster. If you budget just will not allow for new arms. Find a set of used low mileage arms. There are millions of them out there as many Mustang owners installed aftermarket arms on their cars and have the stockers just sitting around.