Throttle Cable: Use a throttle cable from a 87-88 4 cyl car. It has the correct ends to work on the Cadillac throttle body.
Thermostat housing: You can use a Thermostat housing from a 4 cyl car on the Cadillac 4.9L Swap. It eliminates the need for the 3 wire temp sensor because you can use the factory temp sender for the gague in the hole in the housing. You also wont have to buy the Moroso inline filler neck. The reason I didnt mention this in the cooling section is because it will not work with the Allante intake manifold.
Valve Covers: You will want to swap your valve covers from side to side. This makes it easier to fill your oil. They can be swapped with no modifications needed.