Please no stupid replys on this one. The guy is trying to get his truck running and possibly race. We need to start from the beginning.

First things First.
You said you have been peicing it together when you get money.
Is This the first time you have run the truck?
Did you break in the motor?
If it's broke in, Is it tuned correctly or close. Thats a big one and not a lot of people new to the hobby know how to do it correctly.
You said it sounds like its reving good so I would go to the clutch next.
Silver and gold is good and so is gold/green with all aluminum shoes. The traction level of the surface you run on wil dictate which shoes will be best.
If the clutch and flywheel are good and tight with the correct hardware, next is to check the diffs and drive shafts. A loose set screw on the u-joint could do some wierd stuff and the engine will rev fine but the truck wont go anywhere.
Have a friend hold the front wheels and you spin the rears. your center diff and clutch bell should spin but the front shaft wont. then check the front the same way. If the center shafts are spinning but the wheels are not ( or the wheels spin and the shaft doesnt), you have a loose set screw or uncoupled center drive shaft.
Let us know if you find out whats wrong and also answers to all the questions.