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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.
There good heads. Difference is sr's are for big time stroker race engines or supercharged real high psi race engines. You just would want the jrs. They got nice big intake ports and exhaust with only a 58 cc combustion chamber for good higher compression. Only reason there cheaper is because there cast iron so you got lot more weight. But they perform real well. As long as you arent goin to supercharge later on because they will give you too high of a compression ratio.