About to do a brake bleed - pedal is getting a bit spongy. But I notice that bleed screws on rear drums (1971, April '71) are at the bottom of the assembly. Why is that? Air in fluid rises does it not? Can't remember ever bleeding from the bottom, in any vehicle. Is there are particular technique for bleeding from the bottom? Love to hear what folks have to say.

Are they on the wrong sides possibly?

I don't think it has changed since a year ago.