Hey Allen
Just go to the bone yard and take all the boltons from a V8 incluing mounts and A/C lines. Dont forget that whaterpump you will need that discharge tube on the top of the pump. You will also need the truck oil pan and I would also get the exaust Y pipe and manifolds. don't forget the wiring, PCM and intake plumbing. The most common items to forget about while you are at the boneyard are:
MAF
V8 fuel pump and plumbing
Evap and solenoids
fan shroud (the v8 shorter shroud)
5.3 HARMONIC BALANCER (different from the LS1)