Oh dear God! 318 stroker

I was originally intending to do a "Medioker Stroker" 3.58 stroke 318 for a light truck towing combination with an eye towards fuel mileage via a 3.08 gear GM HD rear and an A-999. But, I've finagled my way into a 5.9 Magnum so I'm curious what I may be able to accomplish with it along the same lines. Anyone out there ever put a 3.31 inch crank in one and bore it to 4.07 before? :lol: