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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.
Not trying to be a d*ck but search bro... there has been 100 threads about this in the past two months. Some very detailed, some not. Search... I promise you will find what you are looking for!
347 cubes easier to get more hp .. but 331 is shorter stroke and more dependable..i have 331 i had a 347 too was cool not alotta diffence in hp really a few hp....and a lil more torq..but the reliablility of a 331 outways a 347///in my exp anyway..