Some questions for a Magnum swap.

Thanks guys. The stock 318 in my 91 Dakota is the first year of factory V8's in a Dakota, but it is the last year of the la. In 92 they went to the Magnum. I am pretty sure a 5.9 Magnum will bolt right in with the mounts I have. I am not sure about the serpentine belt set up I have. I would think I could just swap the front of my motor onto the 5.9 Mag and it would work. I think. Not sure how I would eliminate the smog pump. Once I remove it would i just run a smaller belt? I will send MagnumMopar a pm tomorrow.