Flywheel Question

Ok guys. I've got a bit of a newbie question here. What determines my flywheel? I'm swapping an AX15 behind a small block. It came off of a 3.9 Dakota and I am using that bell as well. They have a different flywheel. The engine in the car uses a 130 tooth with a 10.5" clutch diameter surface. The 3.9 dak used a 143 tooth flywheel with a bigger clutch. What flywheel do I need? Sorry for the newbie question.