1974 Duster 360

I am looking at a '74 Duster 360 as a project for me and my grandfather, I'm planning on rebuilding the engine to get some more power. Does anyone have any suggestions on how to get the most power out of the 360? I'm looking at better flowing heads, and carb, a bigger cam, forged pistons and rods. If there are better options out there like stroking it maybe? I hear the 408 is pretty popular.