In the absence of a 5.9 Magnum I would go with the 5.2 Magnum over and LA 360.
To start with the Magnums have less internal drawers when making power.
They have better Pistons with low tention lighter rings.
They have better flowing heads with bigger valves and smaller combustion Chambers.
They of course are using a roller cam with the 5.2 having more lift than the 5.9.
A lighter rotating assembly.
With better valve springs and the heads drilled for the la intake and the ports cleaned up I believe the 5.2 is a better choice than the la 360. Jmhotihv
