Headers for Vortec Heads. Can I use my old headers?

Disc Brake Conversion: Swapping Drum Brakes with Budget GM Rear Disc Brakes

will HEADS from a NON VORTEC ENGINE FIT a VORTEC ENGINE

Vortec L-31 Engine's Long History and Cylinder Heads

Performer Intake Manifold for Small-Block Chevy w/Vortec Heads