I used the ever popular Mustang II. I believe it was a '77 or'78 but a '74-'78 should be the same. And depending on where you place your engine will determine whether you'll use 4,6,or v8 springs. I set my engine behind the front end so if I remember correctly I used 4 cyl. springs. I first used V8 springs and I had no spring at all. So placement does make a difference.