First Magnum Motor, Needs Guidence (5.9L Ram)

They have great torque from factory what kinda torque are you looking for?

Check the heads make sure they ain't cracked, if so heads obviously. Get a thinner head gasket, from factory they're thick gaskets robbing compression. Port and polish the heads while they're off.
Headers and exhaust probably the better choice. 2.5 all the way back. 3inch is overkill for a smallblock 360. Unless you do single pipe.

I think if you wanted an economical hauler turbo cummins would be a good investment. Ya know what you say...once you go black you never go back...

Just my .02 correct me if I'm wrong on anything