Brake system fluid capacity

Hi. Did a search, couldn't find anything specific to the Caprice, so I'll ask.

I have a '79 Caprice, 4 dr. I use it as my Pure Stock racing vehicle. I'm looking to completely flush the brake system and replace the fluid. My Haynes doesn't give me any idea on what the capacity of the brake system would be - how many pints or quarts of brake fluid do I need to purchase?

Thanks!
MS