Are you talking just the rotating assembly for under $2,000, or are you talking machine work and all?
You can pick up a Forged cobra crank for about $300
ModMax - 4.6 and 5.4 Modular Experts has some good Manley H beam rods for around $450
ModMax - 4.6 and 5.4 Modular Experts also has some good forged pistons for $490-$515
Or you can go to
Modular Mustang Racing and buy one of there rotating assemblies.