There are many interchangeable parts for your 69 Chevelle, I'd recommend that you check with a salvage yard to see exactly what will work they have manuals or databases specifically for interchangeability. Where you live you should have no problem finding what you need. Just down in the valley, I believe in Fontanna, there is a salvage yard called Fins and Flames, they had a 69 300 Deluxe in there that was almost complete. If I were you, I'd try to pull the parts myself off the same car. Have you checked the ecology salvage yard there in Adelano? Also, the 69 Chevelle Malibu usually came with manual drum brakes but could also be ordered with power disc brakes. I have even seen one with power drum brakes. Good Luck.