Juan, LOL just kidding. Please do more research on this site. You will find that the stock Cleveland has some short comings they are as follows:
1. The plastic upper timing gear that attaches to the camshaft. The teeth are made of plastic that break off over time.
2. The Valves are known to seperate from the valve stems since they were produced as a 2 piece valve.
3. The rod bolts are also know to come loose. Althouh not as common as the upper two items.
The additional parts you have? I would definitely install. IMO as long as you do not cut it up and the part is a bolt on bolt off part its no big deal. Panteras have lots of room for improvement.
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