Any 3.0 Long block will bolt in your truck, You will need your old accessories, brackets, motor mounts distributor intake and exhaust manifolds oil pan and oil pick up tube,etc if you use a motor from a different gen truck or Taurus but all the parts will fit. If you get a motor out of a Taurus you will need to swap head gaskets to Rwd gaskets because the thermostat is on the back of the lower intake on FWD applications and that also means you will have to reuse you lower intake so the thermostat is in the right place. also if you get a Taurus motor, you'll have to swap to a RWD oil pan and pick up tube.
Pretty much If you buy any 3.0, strip it down to a long block then put all your old parts on it will work