[HardcoreZ28]

Vortecs will need work done on the spring areas to accomodate a large enough lift for that kind of power. I know they flow enough to hit the low 400 range but do some research to make sure they will support 500 horse when they are worked.

Spend the money on a good rotating assembly from someone like Eagle or Scat.

As far as cams....pick a manufacturer like Crane or Comp and call them with all of your other engine specs and let them know what you're after with power and engine characteristics and they will help you pick the appropriate cam.

For 500 horse you probably don't need the biggest carb out there.....maybe a good 750 or 800cfm unit...again the manufacturer should be able to help you pick the right size.