Brake drums

Sort of. All of the A-body front drum brake cars used SBP. So, there is no later year, A-body, front drum brakes to swap on.

You could use B/E body drums, but, you'd need B/E body drum spindles and the whole brake set up. And you'd need large ball joint UCA's (73+) or tapered ball joint adaptors just like a disk swap would need.

So there's no swap that I know of that would just be the drums, you'd have to swap the whole brake set up. And if you're doing that, you might as well swap to the 73+ BBP disks, because it would cost about the same.