YES 5.9 Magnum manifolds work in early A bodies. Here is exactly how!

Nice write up! Just a little food for thought. Those Sweet steering joints are racing joints and are not near as beefy as the Borgeson or Flaming River joints. The first time I saw one of those Sweet U joints, a friend was into stock cars and was using them. I made a comment at the time how thin and spindly they looked--Plus the fact that he bought them from Speedway Motors here in Lincoln NE. Just make sure you do compare shopping with these joints. Be safe!