1992 5.9 LA Roller Cam Motor Build?

I too have a roller cam LA 318. Installed it in my1988 D350 truck. Came out of a Dodge Diplomat 1985.I often wondered why Chrysler made them (318/360 LA rollers)when they were coming out with the Magnum. All I know I'm glad they did.
Now when I hit the pic-a-part I'm looking for them.A stroked 390/408 built for torque will be nice for the truck in the future.