99 magnum to 833 tranny?

You will also need a oil pan and pickup tube off a LA360 for the center sump along with a LA pan gasket set. Also needed to make a spacer for the driver side motor mount on one bolt, or a mount for a LA360.

Are you going to keep the serpentine belt or swap over to the LA vee belt system? You can keep the serpentine belt and ran a electric fuel pump . Or swap your old timing cover,water pump to the Magnum,you will need a fuel pump eccentric adapter from hughes . And a balancer to fit your pulley weighted for the magnum.
takes a little doing, but well worth it
Hopes this helps